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Thread: S20 buttress thread
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13th Apr 2017, 10:19 PM #1Most Valued Member
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S20 buttress thread
Hi every one I was planning on cutting a
S20 buttress thread to make some draw bar adaptors .
Is there any thing out of the ordinary butting buttress treads?
I was wondering how to grind the tread form
Azz
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13th Apr 2017, 11:16 PM #2.
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Hello Aaron,
A quick look online suggests that Deckel's S20 buttress thread shares the same geometry as Schaublin's W20 thread, 45/5 degrees. I'm pretty sure Pete F has cut some W20 sized threads to suit his Aciera. If he doesn't comment here you might try sending him a PM. I wouldn't mind having a crack at a W20 myself so it will be interesting to hear how you get on.
This may be of interest if you haven't already chanced upon it - Deckel FP1 Draw Bar Question - Page 2
Bob.
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13th Apr 2017, 11:33 PM #3Most Valued Member
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13th Apr 2017, 11:59 PM #4.
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I'm well thank you Aaron. It is good to hear from you again.
The 45/5 is the angle . Here is an image posted by Paul Churchill on PM showing the S20 profile along with a page lifted from Schaublin's collet catalogue.
Drawbar Thread.jpgCapture.JPG
Bob.
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14th Apr 2017, 02:53 PM #5Most Valued Member
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Em there is some interesting info there.
So it seems like 45deg - a little bit.
I'm not sure how to measure that or to grind a accurate angle. For V threads I use a thread form gauge to help grind the tool .
I'll have a go maybe I'll use the protractor from my combanation square.
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14th Apr 2017, 03:03 PM #6
I cheated and got one of these.
19.7 x 1.666 SV20 Die for W20 Schaublin Collets | eBay
Although the one I got was cheaper than the one linked to above, I think I found it on aliexpress?
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14th Apr 2017, 03:43 PM #7Most Valued Member
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grouse ray. ill have a look. plus i didnt think of that.
ill have a look on aliexpress.
i receintly got a few mt 4 collets from aliexpres
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14th Apr 2017, 10:33 PM #8.
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14th Apr 2017, 11:57 PM #9Diamond Member
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I'm guessing that it would really pay to make sure that you had the angles the right way around, I could imagine someone being pretty cheesed off if his intended thread was 5/45, instead of the 45/5
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15th Apr 2017, 12:23 AM #10Most Valued Member
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15th Apr 2017, 12:39 AM #11
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15th Apr 2017, 12:54 AM #12
I wish. No, this is for the Schaffner Cylindrical Grinder, I got a straight shank ER32 collet chuck, with the intention of making it into a W20 adaptor, I have all the bits needed but haven't got around to doing it yet.
The general plan it to grind the shank between centers to the right taper, then anneal just the part where the thread is to be cut. If it works then the run out should be acceptable ( fingers crossed ).
PS. So, no 102, but there is a Lorch LAS that has crept in.
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15th Apr 2017, 01:14 AM #13Most Valued Member
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15th Apr 2017, 01:42 AM #14.
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Ah ha! I remember the Schaffner now Ray along with Matthew's Lorch. If your intention was to only hold short work pieces in the ER chuck an alternative ( but I guess water under the bridge ) to the W20's buttress thread could have been a P20 style arbor. Identical taper and external dimensions to that of the W20 but with an internal M12 drawbar thread.
The 13 came with a set of imperial P20s. My photos have disappeared so here is one from Niels Machines Niels Machines - Niels Machines
sold-schaublin-13-parts-and-accessories.jpg
BT
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15th Apr 2017, 10:55 AM #15Golden Member
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Hi Aaron,
I had to cut an S20x2 thread when I was modifying the shank on my boring head and I just used the original male thread as a guide to grind the tool. I first ground the 45 degree flank then used a loupe to check the form against the original thread to get the 5 degree as close as possible. An S20x2 thread is pretty coarse so getting a good match was not that difficult. If you grind the 45 degree flank relative to the side of the blank then setup in the lathe is nice and simple too. Because most of the cutting is done by the 45 degree flank you just plunge cut the thread.
Cheers,
Greg.
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