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Thread: Schaublin 102 lathe restoration
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9th Aug 2013, 06:35 PM #61Philomath in training
- Join Date
- Oct 2011
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- Norwood-ish, Adelaide
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- 59
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Not a problem Rob - the wire is there for you.
The LH nut I have spare is a 5/8, 8tpi. They are brass or bronze and are a cylindrical shape, bit over 1" in diameter and probably a bit over that in length (these are vague recollections from my last look at it some time back). Anyway - the information is out there.
Michael
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12th Aug 2013, 06:04 PM #62Most Valued Member
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- Jun 2012
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- SA
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When I purchased the Schaublin it didn't come with a usable dead centre for the tailstock.
There was small brass dead centre with a weird wide angle point on it and that was all.
So I needed a centre, and set about to make one today - in line with the non standard 2 degree taper spec that Schaublin use on these early models.
Spent a day with the TPG making up an absolutely beautifully finished spot on dead centre with a bronzed in hardened tip. An absolute work of art.
Put it in the tailstock ram and it's sloppy as all hell. What the ?
So I dig out the Jacobs Super chuck that came with it that fits perfectly and compare it. Hmmm something not right here.
Get out the reading glasses and read the fine print on the taper.
Morse No 1 - waaaahhhh run outside, beat head on wall 5 or 6 times, bless little Jesus, and go for a loooong sit down.
Yep, someone has modified the taper to a Morse in it's 90 odd year history. Should have checked first.
That was the BAD news, the GOOD news is that I can now buy a live centre for peanuts.
Some days it just pays to stay in bed.
Rob
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12th Aug 2013, 09:36 PM #63Senior Member
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- Jan 2010
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- Perth
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- 119
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12th Aug 2013, 10:27 PM #64Most Valued Member
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- Jun 2012
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- SA
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Hi Mark.
Can't show you the taper as I cut it off - useless being undersized, so turned up a plain shank to mount the rest of the centre in a drill chuck or collet for now.
Here's a photo of the bronzed in and TPG ground hardened tip (very high carbon steel).
I annealed the steel before machining (the bronzing process did this), and flame hardened it afterwards.
The old Schaublin cut the taper beautifully (much better than the top slide on my Chinese lathe) and being long travel it was a snack.
tip1.jpg
Rob
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13th Aug 2013, 12:29 AM #65Senior Member
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- Jan 2010
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- Perth
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- 119
Thanks Rob, just seems such an obvious/smart solution. Good on you.
Mark.
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13th Aug 2013, 09:57 AM #66Most Valued Member
- Join Date
- Jun 2012
- Location
- SA
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- 1,649
cheap test bar
One thing you need with a tool makers lathe is a test bar to set it up for each job and although I have one I made up years ago, it's probably not as good as it could be (not ground).
Now I have a TPG I could do that, but have never got around to it.
Anyway I have got another smaller one now that is a perfect size, and was free - came out of an old Canon BJ ink jet printer.
I did a video a while back which shows a simple modification you can do to those cheap dial test indicator kits, and I make passing comment to the test rail aspect in it.
Here's the video if anyone is interested.
How to modify a cheap dial test indicator - an easy fix - YouTube
Cheers
Rob
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