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Thread: Modifying a Wohlhaupter UPA4.
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7th Jun 2017, 07:50 PM #1Golden Member
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Modifying a Wohlhaupter UPA4.
The first picture shows the MT shank being sliced off as it did not fit my machine.
There was a lot of work done to achieve the result shown in the second picture where the modifications to the actual head are almost complete. Now I am working on a couple of interchangeable shanks.
Wohly 1..jpg
Wohlhauper UPA4 - 10.jpg
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8th Jun 2017, 10:57 PM #2
That would have hurt.... even I'm cringing
Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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10th Jun 2017, 11:13 PM #3Golden Member
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This is the Differential Screw which is made from a 20 x 2.5mm socket head set screw. The small end has been screwcut to 16 x 1.5mm as per Wohlhaupter dimensions giving a 1.0mm differential.
Differential Thread.jpg
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11th Jun 2017, 05:07 PM #4Senior Member
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A couple of days ago I had to google Differential Screw because I had never heard of it and now it pops up again. Nice work by the way.
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11th Jun 2017, 10:53 PM #5Golden Member
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Thanks Picko, I have always wanted to have a reason to use a differential screw thread in a project and this was it, although it is not my design, I am just following the original Wohlhauper drawings.
This is what the genuine detachable shank type head looks like.
Genuine Wohlhaupter UPA4..PNG
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13th Jun 2017, 11:18 AM #6.
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Nice work Techo.
Any chance that you might have taken a few photos of the work between the lopping off of the arbor and the head ready for its new arbor? I remember looking very keenly at UPA3s when hunting for a boring / facing head and most featured an integral arbor not readily accommodated in my mill's 30 taper spindle. At the time amputation seemed a bit risky. Your results prove otherwise.
Bob.
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13th Jun 2017, 01:36 PM #7Golden Member
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Yes Bob, I do have some more photos of the various processes although nothing very exciting and the quality is not that good but I will post them later.
Here is the drawing for the UPA3.
WohlhaupterManual008.jpg
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14th Jun 2017, 10:38 PM #8Golden Member
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A few photos of the work in progress -
Drilling and reaming the dowel pin holes on vertical mill.
IMG_1236 (2).jpg
Screwcutting the 16 x 1.5mm thread.
IMG_1239 (2).jpg
IMG_1240 (2).jpg
Screwcutting the differential screw on a small CNC lathe. These screws are quite hard at around 45Rc.
IMG_1199.JPG
Grinding the hardened silver steel dowel pins on a mandrel. I'm not sure how the Wohlhauper dowels are done but on these ones I have a 4mm reamed hole right through. To remove the dowels from the boring head the 4mm hole is filled with grease and a 4mm dowel pin is driven in "hydraulicing" the pin out of the hole.
IMG_1243 (2).jpg
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15th Jun 2017, 12:57 AM #9.
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Thank you for the progress photos Techo.
I'm wondering, would your little blue CNC lathe just happen to be a Hercus Compulathe?
Bob.
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15th Jun 2017, 02:03 PM #10Golden Member
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It is a Compulathe Bob.
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23rd Jul 2017, 11:02 PM #11Golden Member
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The modifications are now finished after relocating a 5mm hole, through the side of the 60mm diameter journal, for a spring and pressure pad. The original hole could not be used because the hole for the differential screw broke through into it making it unusable in it's present position.
The last photo shows the head fully assembled and waiting for a new shank to be finished.
Last Hole.jpg
Final Assembly.jpg
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24th Jul 2017, 10:19 PM #12Golden Member
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Beautiful work Techo.
That's certainly the most ambitious and well executed UPA shank conversion I seen done.
Looks as good as a bought one.
Cheers,
Greg.
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25th Jul 2017, 08:10 PM #13Golden Member
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Thanks Greg, and thanks for the Wohlhaupter information you provided a couple of months ago.
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4th Aug 2017, 10:50 PM #14Golden Member
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I finally got around to starting on the new shanks for the Wohlhaupter, the first one is an MT4, I will also make an NT40. I had one 1200mm length left, of 90mm diameter EN36A, of two that I purchased from a scrap metal dealer about 20 years ago. After about 45 minutes of roughing it out I had the basic shape shown in the pictures.
IMG_1361.jpg
IMG_1362.jpg
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12th Aug 2017, 10:54 AM #15Golden Member
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First cut on a 6.8kg lump of EN36A for the NT40 shank.
NT40 Shank 1.jpg
After roughing out the shank it now weighs just over 2kg's.
NT40 Shank.jpg
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