Author Topic: Hemingway geared rotary table build  (Read 18781 times)

Online sco

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Hemingway geared rotary table build
« on: December 22, 2013, 09:00:35 PM »
Santa dropped off early a kit to build one of these; http://www.hemingwaykits.com/acatalog/info_HK%201190.html

I primarily want it for rounding components but went for the geared version for extra versatility and apparently the table stops are easier to machine than the non-geared version.

Made a start on machining the base and whilst cleaning up the sides a big chunk broke off  :'(  It's very black and dusty to machine so presumably is cast so I think this flaw is called a cold shut?

Simon.

Ars longa, vita brevis.

Offline steamer

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Re: Hemingway geared rotary table build
« Reply #1 on: December 22, 2013, 09:03:39 PM »
Looks like a casting flaw or inclusion to me.

Sounds like a phone call is in order.


Dave
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Online sco

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Re: Hemingway geared rotary table build
« Reply #2 on: December 23, 2013, 12:23:12 PM »
First class response from Kirk at Hemingway - they are sending out a new base casting and replacement worm gear that got damaged in transit which should arrive tomorrow.  :whoohoo:

Simon.
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Offline steamer

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Re: Hemingway geared rotary table build
« Reply #3 on: December 23, 2013, 12:24:31 PM »
Sweet!.....Just in time for Christmas!

Dave
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #4 on: December 23, 2013, 12:44:55 PM »
I have always been impressed with the service from Hemmingway  :ThumbsUp:

Jo
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Offline ths

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Re: Hemingway geared rotary table build
« Reply #5 on: December 23, 2013, 07:58:42 PM »
I turned up at Kirks place a few years ago, expecting a shop, only to find it was their home. Both he and Sandra were absolutely wonderful, and I left with a much heavier suitcase. Good memories of good people.

Hugh.

Offline modeng2000

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Re: Hemingway geared rotary table build
« Reply #6 on: December 24, 2013, 07:39:58 AM »
It is good to know that the service that Neil Hemingway used to give is continuing.

John

Offline Don1966

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Re: Hemingway geared rotary table build
« Reply #7 on: December 24, 2013, 07:31:58 PM »
I can attest to that, I have had nothing but good results with there casting sets. The quality is great and they have been great at replacements of bad a missing parts.

Don

Online sco

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Re: Hemingway geared rotary table build
« Reply #8 on: December 25, 2013, 09:54:04 AM »
 Well the ups man failed to turn up so have to wait to make a fresh start on the base.  Had a spare hour yesterday so machined up the pad bolt that locates the worm spindle bearing.

Simon.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #9 on: December 25, 2013, 02:43:06 PM »
Well the ups man failed to turn up so have to wait to make a fresh start on the base.  Had a spare hour yesterday so machined up the pad bolt that locates the worm spindle bearing.

Simon.

UPS failed with me on a next day from Hemmingway  :Doh: At least there were other bits you could make some swarf on in the meantime  :)

Jo
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Online sco

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Re: Hemingway geared rotary table build
« Reply #10 on: December 25, 2013, 05:57:05 PM »
Well it was Christmas eve and the weather may have played a part.  You are right there is plenty of other bits to be getting on with once the relatives are dispatched.

Simon.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #11 on: December 26, 2013, 01:00:54 PM »
Simon, I know you decided against the non geared table but I thought you might be interested to see a couple of pictures of mine in pieces. As usual I made it out of come in handies, including the base which is actually two parts rivetted/silversoldered together  :naughty:

You will be pleased to know the "Tee" slots are much easier to machine on this table  ;)

Jo

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Offline steamer

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Re: Hemingway geared rotary table build
« Reply #12 on: December 26, 2013, 01:51:42 PM »
I'm half into one of those Jo.  If I ever stop getting additions to the honeydo...I'll finish it.

Dave
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Online sco

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Re: Hemingway geared rotary table build
« Reply #13 on: December 26, 2013, 08:26:36 PM »
Thanks Jo - something I hadn't completely appreciated was the lower overall height of the non-geared version.  The tee slots are going to cause a bit of head scratching - my commercial table has three radial slots but I somehow feel four radial slots might be more useful but then the plans show two parallel slots :-\

Dave - If you do a google search for Thomas rotary table one of your threads from the other place comes up right at the top even though you started the build over three years ago!  :o

Simon.
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Offline steamer

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Re: Hemingway geared rotary table build
« Reply #14 on: December 27, 2013, 02:27:13 AM »

Dave - If you do a google search for Thomas rotary table one of your threads from the other place comes up right at the top even though you started the build over three years ago!  :o

Simon.

YUP

Still sitting there too.....I'll get to it....

Dave


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Offline steamer

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Re: Hemingway geared rotary table build
« Reply #15 on: December 27, 2013, 02:36:36 AM »
OK

Here's some photo's of the build thus far...






In this photo, the stub shaft is made, inserted and used as a mandrel to finish the OD turning and Grooving.

Should of had the blank cut longer.....but C.O.R.



Here's the nut turned and threaded .745-40.



The base blank......



After a trip to the saw



I am now squaring this block up in preperation for a trip to my lathe....and the table.....


Like I said....it's sitting.....I'll get to it.



Dave
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Online sco

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Re: Hemingway geared rotary table build
« Reply #16 on: December 28, 2013, 07:26:04 PM »
Well UPS let me down so still no replacement base to work on.  Instead I machined up the central pivot pin and the lock nut, here they are with the pad bolt.

Simon.
Ars longa, vita brevis.

Online sco

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Re: Hemingway geared rotary table build
« Reply #17 on: January 02, 2014, 09:45:31 PM »
UPS finally delivered the package - looks like they've been playing football with it in the meantime but the contents seem to have survived.

Whilst waiting for the replacement base I've made a start on the table - the supplied stock is quite generously sized so there is an awful lot of cast iron dust to create.

Simon.

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Online sco

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Re: Hemingway geared rotary table build
« Reply #18 on: January 04, 2014, 07:51:42 PM »
The major operations on the table are now done - just needs the T slots and the radial holes drilling.  I Loctited the central pin in whilst the table was in the lathe and then did a final facing skim to make sure it was all on the same plane - hopefully I wont regret bonding the pin in for subsequent machining ops!

Simon.
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Online sco

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Re: Hemingway geared rotary table build
« Reply #19 on: January 09, 2014, 09:34:38 PM »
Been working on the base - haven't completely followed the build instructions so that I could mount it on the faceplate with four bolts.  The table fits though so, so far so good.

Simon.
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Offline Don1966

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Re: Hemingway geared rotary table build
« Reply #20 on: January 09, 2014, 11:32:30 PM »
Hi Simon, looks like it's finally starting to take shape. Nice work bud and I have been watching your progress. I have the non geared table to build and hopefully I can get some tips for doing mine.

Don

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Re: Hemingway geared rotary table build
« Reply #21 on: January 10, 2014, 03:52:47 AM »
Thanks Don,  the non-geared version is quite different though so not sure how much you will pick up.

Simon.
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Online sco

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Re: Hemingway geared rotary table build
« Reply #22 on: January 12, 2014, 06:12:05 PM »
Hogged out the back of the base to make the pocket for the gear - this allowed a trial assembly so I couldn't resist.  With a drop of oil it spins smooth as silk, next job is the worm spindle  :)

Simon.
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Offline Don1966

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Re: Hemingway geared rotary table build
« Reply #23 on: January 14, 2014, 01:18:58 AM »
Cool Simon, they really look nice......... :ThumbsUp:


 :cheers: don

Offline steamer

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Re: Hemingway geared rotary table build
« Reply #24 on: January 14, 2014, 02:35:43 AM »
Nicely Done Simon!

Dave
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Online sco

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Re: Hemingway geared rotary table build
« Reply #25 on: January 18, 2014, 08:23:23 PM »
Spent the day making bits for the worm assembly - started with the main tube which has the central hole drilled slightly eccentric so that you can adjust the worm mesh.  Then drilled and reamed the brass bushes 1/4" to suit the supplied drill rod axle - all going too well!  I then checked the worm which is supposed to be supplied with an accurate bore to suit the 1/4" axle - nope bore was very rough and seemed more like 6.5mm - time for a rethink  >:( 

Had some 7mm drill rod handy so decided to re-bore the bushes to suit and gripping the worm very gently in the chuck bored it out to 7mm.  Turned out ok I think so got on and made the main nut, tomorrows job is the micrometer collar and the hand-wheel.

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Online sco

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Re: Hemingway geared rotary table build
« Reply #26 on: January 19, 2014, 07:54:41 PM »
Today I screw cut the end of the worm axle - no fancy clutches for me so lots of lathe on / off / reverse / on / off repeat.  Also machined up the micrometer collar - used a small 45deg dovetail cutter to machine the graduations.

Simon.
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Online sco

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Re: Hemingway geared rotary table build
« Reply #27 on: January 22, 2014, 09:26:38 PM »
Quick shot of the assembly so far post lapping the gears together.

Simon.
Ars longa, vita brevis.

Offline Don1966

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Re: Hemingway geared rotary table build
« Reply #28 on: January 22, 2014, 11:33:18 PM »
Oh! I like that it's really taking shape and looking good.   :ThumbsUp:

Don

Online Kim

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Re: Hemingway geared rotary table build
« Reply #29 on: January 24, 2014, 03:05:55 PM »
Looking pretty cool Simon!
So what's the brass button in that left hand corner doing?  Does it hold the shaft in place?
Kim

Online sco

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Re: Hemingway geared rotary table build
« Reply #30 on: January 24, 2014, 03:45:43 PM »
I think it's called a pad bolt - quite a neat technique that I've seen on other designs as well.  You prep the pad bolt with a shoulder and drill it's hole first - then you fit the pad bolt and machine the second hole at 90degrees to it so that it just intersects and machines a bit of the pad bolt away.  You then remove the pad bolt and turn down the shoulder before refitting it in the hole.  It works as a very effective grip that seems quite resistant to jamming.
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Online Kim

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Re: Hemingway geared rotary table build
« Reply #31 on: January 26, 2014, 12:57:43 AM »
Thanks Simon,
So am I understanding right, that the pad bolt a way to lock the shaft from turning?
Kim

Online sco

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Re: Hemingway geared rotary table build
« Reply #32 on: January 26, 2014, 07:56:26 PM »
Well it locks the eccentric bush in the base - the worm shaft can still turn though Kim.

I didn't like the design of the table clamp presented in the plans so decide to freestyle and come up with my own version.  First two pictures show the concave faces being machined on the faceplate and then third picture is the side faces being made radial by milling on the rotary table.  The idea was that one way up the clamp locks the table rotation and the other way up the table is free to rotate and the clamp provides the abutment for the table travel stops to bear against - last two pictures show the two modes of operation.

Next job is to graduate the table - 360 marks to make - groan!

Simon.
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Offline Don1966

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Re: Hemingway geared rotary table build
« Reply #33 on: January 26, 2014, 10:30:03 PM »
You do some very nice work Simon. You should have no problem doing the 360 marks and actually it goes quiet fast. You do have the Dividing attachment and the stacking tool don't you? Looking forward to seeing  it done.

 :cheers: Don

Online sco

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Re: Hemingway geared rotary table build
« Reply #34 on: January 27, 2014, 08:20:09 AM »
Don, no dividing attachment or staking tool  :(

Am hoping to get the numerals laser marked at work though.

Simon.
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Online sco

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Re: Hemingway geared rotary table build
« Reply #35 on: February 01, 2014, 08:04:25 PM »
Today I graduated.... 359 times!  During the whole process there was a little voice in the back of my mind 'We are not at home to Mr Cock-up, we are not at home to Mr Cock-up, we are not at home to...'  Luckily Mr Cock-up didn't come knocking so the process went without a hitch.  Whilst I had the graduating setup on the mill I also drilled and tapped the 24 holes for the travel stops.

Simon.
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Offline John S

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Re: Hemingway geared rotary table build
« Reply #36 on: February 01, 2014, 08:31:51 PM »
Simon.
If you are laser marking the numbers at work and they don't have the Thermark spray [ £100 an aerosol - no not a typo, it's a type of ceramic slurry in a solvent made from crushed Chinese Ming vases, 6th dynasty ]
Get some dry moly lube £12 from RS in an aerosol, spray that on, let it dry then nuke it. Wash the surplus off with a bit of solvent and you get a nice crisp black mark.
John Stevenson, Nottingham , England

Online sco

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Re: Hemingway geared rotary table build
« Reply #37 on: February 01, 2014, 08:40:05 PM »
Thanks for that advice John - I don't know whether they have any of that stuff or not but this is how the marking they did on another cast item came out.

Simon.
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Offline John S

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Re: Hemingway geared rotary table build
« Reply #38 on: February 01, 2014, 08:44:58 PM »
Yup that looks like thermark, slight red edge to it.
You must work for a rich company  :cheers: I can't afford it.
John Stevenson, Nottingham , England

Online sco

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Re: Hemingway geared rotary table build
« Reply #39 on: February 01, 2014, 09:45:36 PM »
They spend money like there is no tomorrow  :D

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Online sco

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Re: Hemingway geared rotary table build
« Reply #40 on: February 08, 2014, 07:14:23 PM »
Noisy and nerve racking - cutting the T slots in the table;

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Online sco

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Re: Hemingway geared rotary table build
« Reply #41 on: February 08, 2014, 07:19:51 PM »
Next up a fiddly job making the table travel stops, I started with a bar mounted to the face plate on the lathe to machine the outer radius and profile.  Then transferred the plate to the rotary table to mill the bolt slots.

Simon.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #42 on: February 08, 2014, 07:20:33 PM »
 :headscratch: why didn't you mount it in the lathe to turn that T slot and then add the tapered bit? I am sure that is how I did mine all those years ago.

I have just realised the side of my table doesn't have true Tee slots, the top of the slot is tapered, a much easier turning exercise  ;)

Jo
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Online sco

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Re: Hemingway geared rotary table build
« Reply #43 on: February 08, 2014, 07:33:34 PM »
Jo - the geared version has a completely different style of travel stop to the non-geared table.  There is a simple groove right the way around the table that the stops slide in, then a series of holes that the stops bolt into.

Simon.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #44 on: February 08, 2014, 07:38:02 PM »
 :headscratch: I can put my stops at any position/angle, does that mean that yours are restricted to the prescribed angles   :( admittedly with a worm wheel you can give it a bit more "welly" when rotating it.

Jo
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Online sco

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Re: Hemingway geared rotary table build
« Reply #45 on: February 08, 2014, 08:14:55 PM »
Well I hope any angle - the stops are slotted so the combination of the slot and the 24 holes should allow this.

Simon.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #46 on: February 08, 2014, 08:44:22 PM »
Sorry it must be too late after I opened  my bottle of wine  :DrinkPint:  The idea of slotted and variable location stops  :noidea: How do they achieve the variable angles? Can we have more photos  :headscratch:

Jo
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Online sco

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Re: Hemingway geared rotary table build
« Reply #47 on: February 08, 2014, 08:52:46 PM »
No worries - I aim to finish the stops tomorrow so I'll post some pictures showing how they work  ;)

Simon.
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Online sco

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Re: Hemingway geared rotary table build
« Reply #48 on: February 09, 2014, 12:11:32 PM »
Stops separated from the stock using the mill, and after a bit of a clean up with the file, a shot for Miss Jo Jo showing how they fit and bear up against the abutment.

Simon.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #49 on: February 09, 2014, 12:20:22 PM »
a shot for Miss Jo

I try not to advertise that I am single I don't want to scare off any opportunities :embarassed:

 :thinking: That is definitely different.

Jo
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Online sco

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Re: Hemingway geared rotary table build
« Reply #50 on: February 09, 2014, 12:36:23 PM »
I try not to advertise that I am single I don't want to scare off any opportunities :embarassed:


Feminine logic there I think!
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Online sco

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Re: Hemingway geared rotary table build
« Reply #51 on: February 16, 2014, 08:13:27 PM »
Last few bits to make now, one of which is the graduation marker plate - quite fiddly but looks good in place on the base.  Just the table handle and general fettling to go.

Simon.
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Offline Don1966

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Re: Hemingway geared rotary table build
« Reply #52 on: February 19, 2014, 01:07:40 AM »
Simon that came out great, you did a nice job on it. I like............. :praise2:


 :cheers: Don

Online sco

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Re: Hemingway geared rotary table build
« Reply #53 on: March 15, 2014, 07:57:46 PM »
I'm calling the rotary table done - spent a bit of time lapping the gear mesh to minimise the backlash and it's now less than a 1/4 of a degree.

<a href="https://www.youtube.com/watch?v=tzUf6hPxy2o" target="_blank">http://www.youtube.com/watch?v=tzUf6hPxy2o</a>

Simon.

« Last Edit: March 15, 2014, 08:03:54 PM by sco »
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Offline zeeprogrammer

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Re: Hemingway geared rotary table build
« Reply #54 on: March 15, 2014, 08:19:18 PM »
Beautiful job there. Very nice action.
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Online Jo

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Re: Hemingway geared rotary table build
« Reply #55 on: March 15, 2014, 08:55:46 PM »
 :headscratch: I am sure that is not what I saw racing in the rain this morning.

So when is it going to help make some swarf?  :naughty:

Jo
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Offline steamer

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Re: Hemingway geared rotary table build
« Reply #56 on: March 15, 2014, 09:52:52 PM »
Excellent Job Simon!

Dave
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Offline vcutajar

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Re: Hemingway geared rotary table build
« Reply #57 on: March 15, 2014, 10:13:15 PM »
Excellent job Simon.  I have been quietly following your build of the rotary table and picked up some good tips on the way.

Vince

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Re: Hemingway geared rotary table build
« Reply #58 on: March 15, 2014, 10:44:07 PM »
Nice job Simon,

I enjoyed your build, thanks for posting; I'm sure you will enjoy using it.

Wish I had more time to build tooling, maybe someday down the road.

Dave

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Re: Hemingway geared rotary table build
« Reply #59 on: March 16, 2014, 08:46:30 PM »
Simon you have a very useful tool and you made it, something to be proud of. It is very well made and I enjoyed following alone. I like............ :praise2:

Don

Online sco

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Re: Hemingway geared rotary table build
« Reply #60 on: March 16, 2014, 09:33:36 PM »
Thanks guys. 

I'm back on the V8 now, spent the morning assembling the bits I've made so far.  Had forgotten the assembly order so there was a lot of one step forward / two steps back  ::)

Simon.
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Online Kim

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Re: Hemingway geared rotary table build
« Reply #61 on: March 17, 2014, 01:26:24 AM »
Very nice rotary Simon!  Very smooth movement.  You did a great job on it.  As Don said, something to be very proud of!
Kim

 

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