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Post by Nexuas on Mar 7, 2008 13:35:11 GMT
As the title suggest, does anyone know the PCD of the three fixing holes on the Warco BV-20 chuck backing plate. I am making a holder to enable me to mount the 3 and 4 jaw chucks on my mill rotary table, but am not able to accurately measure the diameter of the mounting hole circle. If someone knows then I can just feed the data into the DRO and get it right first time!!!
Thanks in advance...
Russell.
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PH
Seasoned Member
Posts: 112
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Post by PH on Mar 7, 2008 17:50:05 GMT
Why can't you ask Warco?
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Post by Nexuas on Mar 7, 2008 18:29:54 GMT
I could but was wondering if anyone on here knew first...
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Post by ausdan on Mar 7, 2008 21:02:18 GMT
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Post by circlip on Mar 7, 2008 23:23:05 GMT
If you buy a copy of ZEUS it shows you how to work out the PCD from the triangular measurements. I just find it a little sad that despite DRO bells and whistles basic maths still seems to be needed, I remember doing this in geometry despite it being over fifty years ago.
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Post by freddo on Mar 8, 2008 12:30:43 GMT
If you are a DRO man, I assume you have a rotary table ... Centre your rotary table under the spindle of the mill. Mount the chuck back-side up, central to the rotary table and using a digital hole finder (which I'm sure you also have), find the centre of one of the holes in the back of the chuck.
Now crank the handles and look at the DRO's and it will tell you the radius of the holes from the centre - multiply that by 2 for the PCD
Freddo
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paul
Member
Posts: 8
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Post by paul on Mar 8, 2008 12:52:44 GMT
Russell I think if you measure the distance between the hole centres accurately (D) you can calculate from:
PCRadius = D/2 * cos(30)
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Post by freddo on Mar 8, 2008 13:26:27 GMT
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Post by Nexuas on Mar 8, 2008 21:04:08 GMT
Thanks guys I knew you would know a solution... will get the vernier out and calculate when I get in the workshop on tuesday...
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Post by Nexuas on Mar 9, 2008 12:55:16 GMT
Managed to do it this morning, anyone interested the PCD is 82mm diameter with three holes at 5/16" for the Warco BV-20. Or this is what worked for me...
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