Sometimes there’s no correct arbor screw for holding a face mill to an NMTB50 arbor and we use a SHCS and thick washer cut down to fit the hole in the face mill. See pic. Is this particularly dangerous or something everyone does? I found “real” arbor screws at Shars reasonably and ordered a few but they only sell 4 sizes.
Is there a minimum clearance between the work and the big head of the arbor screw? Sometimes the head is at about the same vertical distance from the work as the inserts, realizing of course that the cut will increase this distance when work feeds part moving inserts.
Also I have no doubt you observant folks will bust me for substituting one insert different from the rest, which I wouldn’t do except we ran out of matching ones and we’re only doing rough cuts with this setup. The only thing I think the different insert might screw up is the surface finish. Agree or not?
Is there a minimum clearance between the work and the big head of the arbor screw? Sometimes the head is at about the same vertical distance from the work as the inserts, realizing of course that the cut will increase this distance when work feeds part moving inserts.
Also I have no doubt you observant folks will bust me for substituting one insert different from the rest, which I wouldn’t do except we ran out of matching ones and we’re only doing rough cuts with this setup. The only thing I think the different insert might screw up is the surface finish. Agree or not?
Attachments
Last edited: