I had a new 4 inch backplate machined and it will not fit the spindle taper! I used the taper dimensions from the ST5/108 drawing!
I am replacing a pneumatic chuck made by MicroCentric model 4-120-3 with a Pratt model 9580-01005 100mm chuck size.
Did Denford or MicroCentric make the backplate? Did Denford use a special or different taper for the MicroCentric chuck?
Is there a drawing with dimensions for the chuck mounting area of the spindle?
Find attached pictures! The DSCN0398 is with the MicroCentric backplate mounted.
Carl
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Added pictures of new chuck back on lathe. One shows that I now am down to .014" gap on the back and the other shows the new back mounted!
Carl
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Added model view of dimensions to enlarge the taper thru hole. At .011 gap at this time!
Carl
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5-6-2022
Down to .003". Will put a chamfer on the corner and check that out!
Carl
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5-26-2022
The Pratt 100mm chuck mounted with .0002 TIR.
Carl
Attachments:
- DSCN1114.JPG (300.62 KiB) Viewed 14993 times
- DSCN1113.JPG (363.48 KiB) Viewed 14993 times
- DSCN1112.JPG (255.22 KiB) Viewed 14993 times
- Taper 2.JPG (10.42 KiB) Viewed 15062 times
- Taper 1.jpg (14.29 KiB) Viewed 15083 times
- DSCN1100.JPG (207.76 KiB) Viewed 15152 times
- DSCN1099.JPG (182.16 KiB) Viewed 15152 times
- DSCN0817.JPG (240.89 KiB) Viewed 15304 times
- DSCN0398.JPG (214.12 KiB) Viewed 15304 times