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Thread: Hollow tube rotary welding table
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18th August 2015, 02:36 PM #1SENIOR MEMBER
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Hollow tube rotary welding table
I really hate it when I use a lathe as a welding jig so I thought I would do something about it.
I decided to make this with a hollow tube (88mm I.D) as it should make it quick and easy for welding flanges onto shafts,
the hole in the shaft/faceplate will be fitted with a removable bush/plug when the big hole is not required and can be made to centre small jobs.
The front and rear bosses will have 4 bolts in them to centre material in the tube in the same manner as a 4 jaw chuck,
I have fabbed a face plate that will be welded the front boss.
The tube will rotate within 8 x 6204 brgs, 4 at front and 4 towards the rear, think pipe roller, and a couple more
for thrust, rolling on a disc.
Yeah I know some will think that is rough but that is what I have got and it won't have much load on it and
it only spins at low revs anyhow.
I was just going to use a toothed belt drive reduction to the shaft with a speed controller http://www.jaycar.com.au/Power-Produ...oller/p/MP3209 but it needed a bit more gear reduction as at very low rpm the motor was a bit weak, so with the change of plans it will now also get a neutral position and a shaft lock by sliding the gear set out of mesh.
I decided to make a gear reduction out of Briggs & Stratton camshaft gears, I was going to press the ring gear onto the boss with some loctite, I'm having a bit of a brain fart about this ?
Both parts are machined to 3.700", I wanted a light press fit but now I don't think that is a good idea as the ring gear is CI and
could crack, so what is the consensus about how much clearance I should give it in order for the ring gear to be slid onto the boss and be retained by loctite alone ?
shed
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18th August 2015 02:36 PM # ADSGoogle Adsense Advertisement
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18th August 2015, 03:44 PM #2
The smaller the gap the better, you might be able to find some loctite data on-line, but a sliding fit would be a good start.
One thing to keep in mind is that loctite comes loose at high temperatures, so it might not work if it's close to where you are welding.
Another alternative might be to go for a heat shrink fit?
PS. Looking very slick so far
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18th August 2015, 04:29 PM #3Member
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Braze it?
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18th August 2015, 04:38 PM #4GOLD MEMBER
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Do you still have the matting part from the B&S? what size it is?
If you want to go the loctite route
Q5: What is the optimum fit for using anaerobic retaining compounds if I want to maximize my shear strength?
A: A slip fit would be suggested. The optimum fit for thinner products like LOCTITE 609 & 603 is 0.001-0.003' on the diameter. The optimum fit for thicker products like LOCTITE 620 & 638 is 0.002-0.004' on the diameter.
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18th August 2015, 06:26 PM #5SENIOR MEMBER
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G/day Ray, the ring gear is to be fitted at the far end of the shaft away from the heat, also I think that mounting work on standoffs will reduce heat transfer.
I thought about the heat shrink fit caper but the gear is pretty thin and I had premonitions of hearing a little tink as it cooled,
anyway now that I have bored it it wouldn't be tight enough.....
shed
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18th August 2015, 06:27 PM #6SENIOR MEMBER
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18th August 2015, 06:28 PM #7SENIOR MEMBER
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G/day Stuart, there is no mating part, in one of the photo's I put in a another camshaft just to show what the ring gear
was snaffled from.
Thanks for that data, you gave me a shove in the right direction.
This loctite looks like it will do the job nicely http://www.loctite.com.au/3320_AUE_H...=8802649407489
Pity the local ind. supplier hasn't got it
shed
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18th August 2015, 06:42 PM #8GOLD MEMBER
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Do you have access to dry ice (frozen stuff not the other), wrap the tube in plenty of news paper and fill it with the dry ice to shrink it. Then fit the gear. Have repaired a few cracked engine cylinders this way.
Kryn
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18th August 2015, 06:50 PM #9SENIOR MEMBER
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18th August 2015, 08:02 PM #10I break stuff...
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Bearing Wholesalers in Lilydale has a pretty good range of Loctite gear - got some 609 there not long ago. Not too sure about 620, but could be worth a phone call at least, if you're heading that way.
Also thought I'd mention, although you probably already know, Bunnings now do oxy and acetylene in a Swap and Go type deal....
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18th August 2015, 10:33 PM #11
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18th August 2015, 10:40 PM #12Intermediate Member
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19th August 2015, 03:27 PM #13GOLD MEMBER
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20th August 2015, 09:16 AM #14SENIOR MEMBER
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Thanks Jekyll, they didn't have it either so they are getting it in.
Regarding the gas, I read about it in the welding forum a few weeks back, I reckon that when the crunch comes and I need to get
gas, for whatever that may be, I will likely just get an oxygen and use LPG with the comet 3.
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20th August 2015, 09:37 AM #15SENIOR MEMBER
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