I have a new Pratt Burnerd 3 jaw on its way to me. It's unused but has no backplate so im looking at D1-3 options.
I can see quite a few backplates for sale, the fully machined are pricey for what I will use it for and I quite fancy having a go at machining a D1-3 blank back plate these come with the d1-3 side machined but the chuck side needs machining to suit. My question is, am I right in thinking the accuracy comes from the recess on the back plate and not the mounting bolts? Is there some tolerance to the bolt holes on the chuck to give some wiggle room?
My reason for asking is I don't have a mill to accurately drill the holes, I'm confident I can machine the recess on the lathe to take the chuck but then my only option will be to mark the hole centres using a transfer punch through the chuck and drill and tap the M10's on the backplate using the Fobco drill press as best I can.
Anyone see any issues with the plan am i over thinking?
I can see quite a few backplates for sale, the fully machined are pricey for what I will use it for and I quite fancy having a go at machining a D1-3 blank back plate these come with the d1-3 side machined but the chuck side needs machining to suit. My question is, am I right in thinking the accuracy comes from the recess on the back plate and not the mounting bolts? Is there some tolerance to the bolt holes on the chuck to give some wiggle room?
My reason for asking is I don't have a mill to accurately drill the holes, I'm confident I can machine the recess on the lathe to take the chuck but then my only option will be to mark the hole centres using a transfer punch through the chuck and drill and tap the M10's on the backplate using the Fobco drill press as best I can.
Anyone see any issues with the plan am i over thinking?