How repeatable is the chuck in itself? If there's any wear in the jaws, scroll or scroll to body, you might find you'd be as well using a 4 jaw chuck as you'll need to adjust it every time you open the jaws. Fingers crossed it's tight enough to be worthwhile for you though.Made a new back plate for my 6" 3 jaw chuck as its always been inaccurate enough to be annoying , looked at various ways to make it adjustable it but settled on one of my own design as I was very limited on space and only really need 0.5mm movement.
turning the backplate was fairly simple ive discused on here before
View attachment 535880
Cereal box calculations for pcd drilling on the mill there was only enough room to use M6 grub screws for adjustment
View attachment 535881
milled slots in the backplate to accept 16mm cubes bolted down and some had to be chamfered as so close to the scroll adjustment gears
View attachment 535877
could of ditched the cover plate but should stop some swarf clogging it up and was a challenge to machine
View attachment 535878
then had to drill 4 holes and tap to m6 in the chuck with no room for error as if anything not at the correct angle moving set screws will ramp the opposing set and be impossible to set
View attachment 535876
First test was worrying but but managed to get 0.01 runout without too much playing around so really pleased , its taken me about 2 years to get round to doing this but wanted to see if i could with limited skill
View attachment 535879
Never going to be able to afford a TRU SET chuck but for about £20 in materials ive got something close
I need to make or modify a backplate for a VERY rare chuck I have - and it looks like it has never been used. Insanely heavy 10" 4 jaw pratt burnerd with a scroll AND independent jaws. It weighs more than my 16" 4 jaw D1-8.Made a new back plate for my 6" 3 jaw chuck as its always been inaccurate enough to be annoying , looked at various ways to make it adjustable it but settled on one of my own design as I was very limited on space and only really need 0.5mm movement.
turning the backplate was fairly simple ive discused on here before
View attachment 535880
Cereal box calculations for pcd drilling on the mill there was only enough room to use M6 grub screws for adjustment
View attachment 535881
milled slots in the backplate to accept 16mm cubes bolted down and some had to be chamfered as so close to the scroll adjustment gears
View attachment 535877
could of ditched the cover plate but should stop some swarf clogging it up and was a challenge to machine
View attachment 535878
then had to drill 4 holes and tap to m6 in the chuck with no room for error as if anything not at the correct angle moving set screws will ramp the opposing set and be impossible to set
View attachment 535876
First test was worrying but but managed to get 0.01 runout without too much playing around so really pleased , its taken me about 2 years to get round to doing this but wanted to see if i could with limited skill
View attachment 535879
Never going to be able to afford a TRU SET chuck but for about £20 in materials ive got something close
