Author Topic: Potty Lads and Dads Mill Engine  (Read 32539 times)

Offline steamer

  • Global Moderator
  • Full Member
  • *****
  • Posts: 10100
  • Central Massachusetts, USA
Re: Potty Lads and Dads Mill Engine
« Reply #30 on: April 20, 2013, 10:38:36 AM »
Nice project and build Stew!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline sbwhart

  • Full Member
  • ****
  • Posts: 698
  • Live Long and Prosper
Re: Potty Lads and Dads Mill Engine
« Reply #31 on: April 20, 2013, 12:58:30 PM »
Cheers Dave

this mornings job was to make the con rod. Cut a length off 1/4*5/8 mild steel bar allowing a little extra on the length.

Mark it out then drill the hole for the bearing, to get it flat place the bar on the table put the vice over the top and clamp up on the bar, that it nice and level with the top of the vice.



Drill 8mm



Then centre drill each end for turning between centres



Its a bit of a awkward shape for fitting a drive dog to so,

With the four jay self centering chuck turn a 6o deg point on a bit of bar.



Set this back in the chuck then with a life centre in the tail stop, the chuck jaws act as the drive dog.



Rough the material out rough shape and face the end to length leaving a pip.



Slew the compund round 3 deg then with a radius tool finish off



Flip it round and turn the other end at the 3 deg setting.

A bit of work with a filing button and drill and tap for fixing the brasses and its

Job Done



Stew

A little bit of clearance never got in the way

Offline zeeprogrammer

  • Full Member
  • *****
  • Posts: 6369
  • West Chester, PA, USA
Re: Potty Lads and Dads Mill Engine
« Reply #32 on: April 20, 2013, 01:18:28 PM »
Nice con rod!
I liked that tip on using the chuck jaws as a dog.
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline NickG

  • Global Moderator
  • Full Member
  • *****
  • Posts: 1430
Potty Lads and Dads Mill Engine
« Reply #33 on: April 20, 2013, 08:20:54 PM »
Yeah that was a good idea turning your own centre - knowing me I'd do it from too small a bar and the jaws wouldn't be open enough!

Offline ths

  • Full Member
  • ****
  • Posts: 1801
  • Kangaroo Valley, NSW, Australia
Potty Lads and Dads Mill Engine
« Reply #34 on: April 20, 2013, 11:32:10 PM »
I'm also voting for the four jaw and centre. A very popular candidate of the day. Nicely done, Stew.

Hugh.

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13140
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: Potty Lads and Dads Mill Engine
« Reply #35 on: April 21, 2013, 12:55:27 AM »
Nice technique Stew, and obviously a great result...keep it coming :)

Bill

Offline sbwhart

  • Full Member
  • ****
  • Posts: 698
  • Live Long and Prosper
Re: Potty Lads and Dads Mill Engine
« Reply #36 on: April 22, 2013, 10:02:57 AM »
Thanks for your kind comments Guys

Onwards and Upwards with the bearings housings.

These are made from 5/16 thick bar not 1/4 as in the drawing i thought 1/4 would look a little flimsy.

Fist job measure the height of the piston rod to make the bearing centre height the same, then cut a couple of chuncks of the bar roughly square the ends up with a file and mark them out then as for the con rod centre drill the ends for between centre turning, I cut some of the surplus material off by hacksaw first then on to the lathe for facing off to length and turning to shape.



For the next bit I desided to fit my vice stop to my new drilling vice this was just a mater of drilling and tapping a M6 hole into the side of the vice.





Then onto the drill for drilling the 12m hole for the bearing I made sure that the base of the bearing was up against the fixed jaw and that the vice was firmly bolted down and the stop set.

Drill the first housing then without unbolting the vice drill the second again with its base up against the fixed jaw this way the centre height will be the same for both housings.



Then drill the bolting down holes 2.5mm dia again taking advantage of the vice stop, I wish I'd added this before I started.



The give them a good seeing to with a file and filing button the shape the top



Turn up the bearing.



Fit them in place with some loctite

and its another job done



Stew
A little bit of clearance never got in the way

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13140
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: Potty Lads and Dads Mill Engine
« Reply #37 on: April 22, 2013, 11:40:11 AM »
More good stuff Stew, and there are some good tips in your write ups that will benefit newer and younger modelers. Looking forward to each update :)

Bill

Offline sbwhart

  • Full Member
  • ****
  • Posts: 698
  • Live Long and Prosper
Re: Potty Lads and Dads Mill Engine
« Reply #38 on: April 22, 2013, 12:36:38 PM »
Thanks Bill

Bit more done:- the Cross head

Made from a bit of oblong section bar, start by marking the centre on a end face accuratly centre pop the position.

The using a wobble bar centre it up using a four jaw independant chuck.



Turn a step up centre drill and tap M4 for the piston rod.



Keeping it on the bar helps you to securly clamp it, drill a couple of hole to form the slot.



Flip it on its side and drill for the end pin.



Then cut it off the bar hacksaw the slot and file to fit

And its another one done.



Stew
A little bit of clearance never got in the way

Offline Captain Jerry

  • Full Member
  • ****
  • Posts: 967
  • Summerfield, FL USA
Re: Potty Lads and Dads Mill Engine
« Reply #39 on: April 22, 2013, 03:30:23 PM »
Stew

This is a great project.  I hope that it inspires people with limited equipment to expand their horizons.  It is great that you do not let the limits that you have set on this project to be used as an excuse for sloppy work.  Hacksaws and files can produce fine results as you so nicely show.

Jerry
There are thing that you can do and some things you can't do.
Don't worry about it. try it anyway.

Offline Bearcar1

  • Full Member
  • ****
  • Posts: 682
  • Chicagoland Area, USA
Re: Potty Lads and Dads Mill Engine
« Reply #40 on: April 22, 2013, 03:38:48 PM »
I agree. Filing is a much overlooked art form and the lowly hacksaw seems to be neglected a lot of times. This is truly a good series for the beginner to glean much information from as it is displaying good technique in the making of parts. Keep up the good work Stew  :ThumbsUp:


BC1
Jim

Offline Alan Haisley

  • Full Member
  • ****
  • Posts: 669
  • Near Clayton, North Carolina, USA
Re: Potty Lads and Dads Mill Engine
« Reply #41 on: April 22, 2013, 05:33:02 PM »
Stew,
With pieces like this, do you do layout marks on both faces before sawing and filing?
Alan
 
Near Raleigh, NC, USA

Offline sbwhart

  • Full Member
  • ****
  • Posts: 698
  • Live Long and Prosper
Re: Potty Lads and Dads Mill Engine
« Reply #42 on: April 22, 2013, 05:57:04 PM »
Hi Alan

Sometimes i will mark larger parts out, but with the cross head being quite small, I just made it fit the con rod and filed the rads by MK1 eye ball.

Stew


A little bit of clearance never got in the way

Offline ScroungerLee

  • Full Member
  • ****
  • Posts: 299
  • Southwest Connecticut, US, North America, Earth
Re: Potty Lads and Dads Mill Engine
« Reply #43 on: April 23, 2013, 02:30:02 PM »
From a technical point of view doesn't making a center in your chuck and then moving it negate the benefit of turning the center in place?  From a practical point of view, keeping the center aligned with chuck in the same position it was turned, surely means it works out fine.

Sorry to be so picky, it just popped into my head as I was reading your excellent write up.  I am enjoying it very much.

Lee
Mmmmm.... Shiny!

Offline EmanMyford

  • Full Member
  • ****
  • Posts: 28
  • Durban, South Africa
Re: Potty Lads and Dads Mill Engine
« Reply #44 on: April 23, 2013, 03:24:56 PM »
Hi Stew,

Thanks for your detailed explanation and excellent photographs. I'm really enjoying this build  :ThumbsUp:

Kind Regards.
Ewald