Cutting along the flat side of a horizontal mill.

[agfrvf]

You do not say how deep the slot is or how hard the 4140 is.

Its annealed and about 1/8" deep. Well within aspect ratio of endmill.

 

[benmychree]

Yes, it is, and 4140 ann. cuts quite easily, better a 3/32" endmill than 1/16 --- no worry about burning up a HSS endmill with the RPM of the horizontal !

 

[BaronJ]

I want to cut a precise slot on my horizontal, however no tooling exists for the width I need. Can I skim .010 off with the flat face to the side?

Why not just use a narrower cutter and take two bites at it !

Oops, misread that ! I thought it was 1.05" sorry.

 

[agfrvf]

Yes, it is, and 4140 ann. cuts quite easily, better a 3/32" endmill than 1/16 --- no worry about burning up a HSS endmill with the RPM of the horizontal !

Calculator is spitting out DOC 0.023 IPM .7/.4 I'll try on scrap