New 4" Backplate For NovaTurn Will Not Fit

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cskipper
Posts: 21
Joined: Tue 25 May , 2010 15:55 pm

New 4" Backplate For NovaTurn Will Not Fit

Post by cskipper » Wed 06 Apr , 2022 12:59 pm

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

==========================

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

======================
5-26-2022
The Pratt 100mm chuck mounted with .0002 TIR.

Carl
Attachments
DSCN1114.JPG
DSCN1114.JPG (300.62 KiB) Viewed 4425 times
DSCN1113.JPG
DSCN1113.JPG (363.48 KiB) Viewed 4425 times
DSCN1112.JPG
DSCN1112.JPG (255.22 KiB) Viewed 4425 times
Taper 2.JPG
Taper 2.JPG (10.42 KiB) Viewed 4494 times
Taper 1.jpg
Taper 1.jpg (14.29 KiB) Viewed 4515 times
DSCN1100.JPG
DSCN1100.JPG (207.76 KiB) Viewed 4584 times
DSCN1099.JPG
DSCN1099.JPG (182.16 KiB) Viewed 4584 times
DSCN0817.JPG
DSCN0817.JPG (240.89 KiB) Viewed 4736 times
DSCN0398.JPG
DSCN0398.JPG (214.12 KiB) Viewed 4736 times

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