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Thread: Hollow tube rotary welding table
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20th August 2015, 09:39 AM #16SENIOR MEMBER
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I ended up skimming .005" off the boss just to get the ring gear to slide onto the boss nicely, now I have the problem that when I
put the gear on and then tapped the boss onto the end of the pipe the gear locked up on the boss.
The pipe turned out of round with a tipped tool and I averaged the size to bore the boss, so I think I will chuck that pipe in the bin
and start fresh but this time use HSS to turn it, maybe machine it with the TPG ?
Black pipe isn't fun to work with.....
shed
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20th August 2015, 09:41 AM #17SENIOR MEMBER
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20th August 2015, 12:04 PM #18GOLD MEMBER
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How are you going to hold the boss to the pipe?
I'm thinking you can remachine what you have. It would seem to be to big after all.
Or fit the boss to the pipe (weld?) then remachine the seat for the ring gear.
Stuart
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20th August 2015, 02:59 PM #19SENIOR MEMBER
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G/day Stuart, I wanted to press the boss onto the tube then 4 light weld's internally approx 20mm long 90 deg apart, and then slide and loctite the ring gear on.
1/ My thinking is now to start fresh and bore the inside of the pipe with the hope I can end up without it being oval, then make a plug with a centre hole to support that end in the tail stock and hopefully end up with a better machined surface to fit the boss onto. ? After the bosses are welded on to the tube I have a bit of machining to do on the tube to finish it so holding the ends well is probably a good place to start.
2/ Or maybe press the boss on the with the ring gear in place and that will give the the ring gear the interference fit, then after welding the boss to the tube give it a squirt of that loctite that wicks in after assembly ?
3/ If the gear comes loose later on at some stage, which I doubt given it isn't under much load, then could tack it in place with a ss rod ?
4/ There is quite a bit of stress in that black pipe, so maybe I need to stress relieve it first ? Ho hum ???
shed
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20th August 2015, 03:31 PM #20GOLD MEMBER
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Hi Shed
So why not do that with what you have?(remachining the seat after welding, you can make a plug to fit the boss.)
Another idea set the the boss(or the tube) and relieve the bore "under" the gear.(it looks to be a pretty thin wall there). Then the press fit is taken by the thick part of the boss and should much less effect on the gear seat size.
I dont like this idea. You'll have unknown interference and not wanting interference on the gear is how we got here .
Stuart
p.s. I dont know how big your lathe is but is it possible you've tighten your 4jaw(?) to much and deformed the tube?
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20th August 2015, 04:00 PM #21SENIOR MEMBER
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Yes Stuart it is all pretty thin, there is not much to play with and I'm not really happy with the tube.
It's hard not to deform the tube, so I really need 2 plugs, 1 inside the tube at the chuck end also.
I machined the tube in my macson lathe as that has fixed steady that would accommodate the tube, the tube being out of round to start with doesnt help, but I think if i can get a reasonable bore at each end and the use a centering plug for the rest of the machining i might get somewhere, I would like that boss to very lightly press on.
Then I spoze I could still take a whisker off the boss for the gear after it is welded.
thanks... shed
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