Author Topic: Globe valve and Handwheels  (Read 31094 times)

Offline smfr

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Re: Globe valve and Handwheels
« Reply #30 on: December 29, 2012, 04:30:18 AM »
Well, I spent most of the day twiddling the handles on the rotary table :D Tried various types of hand wheels for the valve, and some worked better than others. I didn't want to turn huge amounts of brass into swarf, so started with some disks parted/hacksawed off from a 1-1/4" bar, drilled 3/8" with a bit of cleaned 3/8" bar as a hub:



These were silver-soldered together (which I'm getting the hang of, I'm glad to say):



which gave me my starting material:



The solder joints are totally invisible on the final parts. This technique seemed to work well.

The basic procedure was some turning on the lathe on both sides of the part, cleaning up both the face and the hub of the exposed end, and doing whatever profiling on that face is required for the style of wheel. The hub was taken down to a diameter that I could hold in a collet later. For some, that required the pointy tool:



and for my third wheel style, which has a deep groove in the underside, a creatively-ground tool  :Lol:



I then flipped the part around in the chuck; gripping the newly machined hub ensured good alignment.

Two wheels turned, with different rim styles:



I did a third blank with a more domed shape, here on the left:



After that came a lot of work on the rotary table, counting revolutions of the handle and trying not to screw up :)

The first handle had 6 holes drilled:



and then some edge sculpting with a 1/8" end mill:



I worked out the angles with respect to each 60? segment. So, for example, started at 0?, half of a projection was maybe 12? (with the same on the other end of the segment), leaving 36? of indentation. So we start by cranking the rotary table 12?, bring in the end mill, crank 36?, back out the end mill, then crank 24?, mill for 36? etc.

The domed wheel was turned with a deep groove on the underside, so milling slots would break through:



and again the edge was sculpted:



The third wheel had three spokes, so the end mill was plunged, crank for some fraction of 120? (accounting for spoke thickness and mill diameter), raise the mill, crank some more, plunge the mill etc. I also sculpted the edge of this one:



Here are the results:



I'm not super happy with any of them, but it was fun to make them!

The original wheel I wanted to form with three thin spokes. Alas, I had a brain fart when computing how much to crank on each plunge, and made a segment that was too big. I used the rest for spoke practice:



I made another blank to have a second try at spokes. This one was more successful:



but the spokes ended up too skinny  :Doh:



Here you can see my notebook with my attempts at trig, and jottings for angles and hand wheel turns:



Maybe I can rescue the rim of that last one, and just solder in some spokes?

Now, I think I want to make something that doesn't involve fiddly bits of brass  ;D

Simo

Offline steamer

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Re: Globe valve and Handwheels
« Reply #31 on: December 29, 2012, 04:34:19 AM »
I like the one on the right!....13th photo down....

Dave


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Online Jo

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Re: Globe valve and Handwheels
« Reply #32 on: December 29, 2012, 08:23:19 AM »
I like the one on the right!....13th photo down....

I like that one too. 8)

Simon if you look at my E&A thread http://www.modelenginemaker.com/index.php/topic,393.0.html reply 7 I mentioned how I make hand wheels with thin spokes. It may give you a little inspiration.

Jo
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Offline zeeprogrammer

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Re: Globe valve and Handwheels
« Reply #33 on: December 29, 2012, 01:13:43 PM »
I like them all.
Now I'm interested to see what you're going to build to attach them to.  :D
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Offline gbritnell

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Re: Globe valve and Handwheels
« Reply #34 on: December 29, 2012, 04:40:37 PM »
Outstanding work on the handles. These will surely dress up a valve. I like most of the designs but am partial to the first and third in the one picture of three.
gbritnell
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Offline NickG

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Re: Globe valve and Handwheels
« Reply #35 on: December 29, 2012, 07:59:19 PM »
Nice work, I like the one on the left of the three but with smaller holes drilled.  :ThumbsUp:

Offline Firebird

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Re: Globe valve and Handwheels
« Reply #36 on: December 29, 2012, 08:27:34 PM »
Hi Simon,

I'm really liking this  :praise2:

One question is the oil hardening ground steel plate also known as guage plate?

cheers

Rich

Online Jo

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Re: Globe valve and Handwheels
« Reply #37 on: December 29, 2012, 08:30:41 PM »
One question is the oil hardening ground steel plate also known as guage plate?

Yes
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Offline Firebird

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Re: Globe valve and Handwheels
« Reply #38 on: December 29, 2012, 11:04:40 PM »
Thanks Jo

Cheers

Rich

Offline Don1966

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Re: Globe valve and Handwheels
« Reply #39 on: December 29, 2012, 11:25:31 PM »
Simon I love all of them, that was some excellent demo's thanks for posting.

Don

Offline Steamer5

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Re: Globe valve and Handwheels
« Reply #40 on: December 30, 2012, 06:28:39 AM »
This thread just gets better & better! Thanks Simon for starting it & to all who have added to it.

Here's another idea.  Dad brought a loco some years back. After running for some time he had one of the blackhead valve spring a leak. The guy who he brought it from had made up new ones, but hadn't assembled them, he had made them from stainless as well. So how to hold them together & aligned while silver soldering, well we just happened to have some carbon rods, so 1/4" one was chucked up & urged to a neat fit in the bits, fluxed soldered job done, & if the carbon doesn't drop out its very easy to brake up& remove. Hope this is of use to somebody, as it sure worked for us.

Merry Xmas & have a happy & safe New Year

Cheers Kerrin........
Now back to the workshop to put the mill nback together ( that's another story)
Get excited and make something!

Offline tel

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Re: Globe valve and Handwheels
« Reply #41 on: December 30, 2012, 08:54:08 AM »
 ;D :ThumbsUp: on the carbon rods - I've been known to pull the cores out of D cells and machine that to fit. Works a charm.
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Offline smfr

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Re: Globe valve and Handwheels
« Reply #42 on: December 30, 2012, 05:34:31 PM »
I'm not picturing how the carbon rods are used. Do you mill a pocket in the rod to keep the parts being soldered aligned? Or make a "spindle" from carbon for the same reason? Does the carbon burn away on soldering, or just survive the heat?

Simon

Offline zeeprogrammer

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Re: Globe valve and Handwheels
« Reply #43 on: December 30, 2012, 05:50:40 PM »
I'm not picturing how the carbon rods are used. Do you mill a pocket in the rod to keep the parts being soldered aligned? Or make a "spindle" from carbon for the same reason? Does the carbon burn away on soldering, or just survive the heat?

I'm interested in knowing that too. Pics would be very helpful.
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Offline tel

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Re: Globe valve and Handwheels
« Reply #44 on: December 30, 2012, 06:35:51 PM »
They are used in existing holes, to keep said holes in alignment and clear of solder during soldering.
Especially useful when you are joining oddly shaped bits - like my Rocking Valve engine cylinder (attached)
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