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Thread: Split brass bush !
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7th May 2013, 06:56 AM #1
Split brass bush !
Hi guys,
I'm having a problem trying to figure out how to make a split bush bearing out of a short length of brass bar.
I have a 3/8" diameter shaft that has larger 1/2" diameter ends. So I need to make a bush that will press fit into a 7/8" diameter hole that will act as a bearing for the 3/8" shaft.
Suggestions please !
Thanks in advance:
BaronJ
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7th May 2013, 07:30 AM #2Philomath in training
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The way I've heard it done in the past is to cut the brass in half and then soft solder it together again. Make up the bush (with the split going through the centre of the brass) and the when finished, de-solder.
Never done it but I've seen pictures of the results from those that have.
Michael
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7th May 2013, 07:58 AM #3Most Valued Member
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Hi BaronJ,
Michaels suggestion is the normal preferred way and works quite well, you just need to remember that, depending on the final tolerance, you will have to machine in enough clearance. When you remove the solder after separating you will close the bush up and this needs to be compensated for. Or, you can shim the two halves instead of machining the allowance in.
My preferred way is to split afterwards and shim to replace the saw cut. This way you have the facility to close up the bush as wear and tear takes place. Either way, shimming is required, which isn't a bad thing.
Phil
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8th May 2013, 07:00 AM #4
Hi Guys,
Thanks for the suggestions. I'm not keen on soldering two pieces together, however now its been pointed out to me I think that its a job for the four jaw chuck. Two pieces of flat brass bar can be clamped together in the chuck and drilled with a pilot hole, then the outside turned to diameter for the one inch length. If I use a 6mm pilot hole then I can use a short bit of round bar as a spigot. Take the whole lot out, turn it around and use the three jaw to hold it together whilst I bore and ream the hole to 3/8".
Does this sound like a plan or have I missed something ?
Thanks.
PS. I will have to buy a camera and take some pictures. )
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8th May 2013, 07:08 AM #5Most Valued Member
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8th May 2013, 07:27 AM #6
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8th May 2013, 07:34 AM #7Most Valued Member
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8th May 2013, 07:44 AM #8Philomath in training
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Phil, I think the reason for the split is that the shaft that runs in the bush has larger ends (see post 1)
Michael
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8th May 2013, 07:48 AM #9Most Valued Member
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8th May 2013, 06:41 PM #10Most Valued Member
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5/8 or 7/8?
You're going to try turning a 1" square(split) gripped by 1/8" in the 4 jaw with about 1" overhang?
How concentric does it need to be?
Stuart
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9th May 2013, 07:42 AM #11
Hi Stuart,
Not quite ! the overall length of the bush is 1"1/8" (1.125"). The idea is to machine this from two pieces of flat brass bar 1" x 0.5" cross section 2" long. Then clamp these together in the four jaw chuck with an overhang very slightly more than I need. Turn the outside diameter first then use a hose clip to secure the machined end. Drill through and then bore and ream to 3/8". Remove, saw off the unwanted material. Put in three jaw and face off.
Remove hose clip and I should have what I want.
At least this is the way I hope.
Just for further information the bar that is referred to in my original post is an old original Moore & Wright long reach tapping chuck. Yes I could machine the T bar end to be the same size as the shaft but I hate the thought of modifying a nearly 90 year old tool that for all intents is unused and original.
Regards:
BaronJ
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9th May 2013, 11:33 AM #12Most Valued Member
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Hi Baron,
Thanks that clears things up.
Stuart
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12th May 2013, 09:53 AM #13
Hi Guys,
Well I went out and bought a Fujifilm Finepix camera today. I've also made the split brass bush !
I hope the photos are Ok, particularly since its my first attempt...
The photos show the initial two pieces of brass bar in the four jaw chuck and then after the major diameters have been turned. There is also a general shot of my Myford lathe. The last two shots show the finished bush after drilling and reaming to 3/8" bore.
I also discovered a slight problem when I tried the bush on the shaft of the tapping tool
But I'll say more about that later when I've had chance to take some more photos.
Regards:
BaronJ
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12th May 2013, 12:25 PM #14
centre
Hi
I am a bit slow
how did you centre the 2 pieces of brass in the 4 jaw ? If the 2 halves of the flat sltock are not centred, then the two halves of the bush would not be concentric
Mike
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12th May 2013, 01:20 PM #15Most Valued Member
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Split brass bush !
Nicely done.
Phil
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