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Thread: Modifying a Wohlhaupter UPA4.
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4th Oct 2017, 01:38 PM #31Pink 10EE owner
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Only thing is those machines do not check carbon content, and they emit X-rays and I believe have a limited life.
Gold, the colour of choice for the discerning person.
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5th Oct 2017, 02:55 PM #32Golden Member
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Yes Kryn, that one cost one of our major scrap recyclers around $40K, as compared to the previous one they used to use which cost 4 or 5 times more and was limited in what it could do.
A better scan showing an exact match, it was a bit hard holding the gun steady on the tapered circular arbor while it took reading.
9310 Scan.jpg
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5th Oct 2017, 09:55 PM #33Golden Member
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I finished the last bit of grinding today, touching up the mating faces and grinding the internal locating diameters to 60mm.
Arbor Internal Faces.jpg
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15th Oct 2017, 10:20 PM #34Golden Member
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This is the set up I used to drill the 10mm pin holes using a Tungsten Carbide end mill to achieve the final diameter. The holes are 40mm between centres.
10mm Pin Holes.jpg
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16th Oct 2017, 09:34 AM #35.
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Crisp as usual Techo.
How did you grind the recessed face of the arbor? A stone with a recessed centre on an internal spindle?
Bob.
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16th Oct 2017, 06:56 PM #36Golden Member
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Yes Bob, that's exactly how I did it.
Internal Grinding.jpg
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16th Oct 2017, 08:49 PM #37.
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Now you have me curious Techo as to how the arbor is mounted to the workhead. Is the brown spacer hollow and both the arbor and spacer held in position by a drawbar? (The problem with such a scenario is that you probably ground the face of the spacer prior to mounting the arbor so something a bit trickier must be going on.)
Bob.
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17th Oct 2017, 09:53 PM #38Golden Member
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You are correct again Bob, the arbor is pulled back against the fixture with a 16mm drawbar made from allthread which inturn pulls the fixture against the flat face of the workhead spindle. The home made eye nut and pin were used to hold the fixture for grinding the ends.
Drawbar and Fixture.jpg
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17th Oct 2017, 11:00 PM #39.
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Fantastic stuff Techo. I'm storing all these tricks away for that rainy day!
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20th Oct 2017, 10:33 PM #40Golden Member
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Thanks Bob, on a side note, did you end up making the Over/Under attachment for your Hommel Werke Height Micrometer.
Lex.
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21st Oct 2017, 02:22 PM #41.
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It's still on the list Lex.
I'm a bit daunted by the spring clip. Any suggestions as to how to make it given that Hommel probably would have used a press to achieve its curved form?
Bob.
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23rd Oct 2017, 10:33 PM #42Golden Member
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It would be a bit awkward to make Bob. I guess you could try making one from annealed spring steel and then heat treating it.
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9th Dec 2017, 08:12 AM #43Golden Member
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A short video showing how the shanks are installed and removed.
https://www.youtube.com/watch?v=3vju1HWbdrI&sns=em
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