I had the need for a longer rack (2ft) for a large fobco drilling machine

I couldnt envisage what/how to do it with my workshop equipment

a local gear cutter wanted £300 or so to make it assuring me that it was absolutely critical that the tooth form was perfect and any inaccuracys would lead it it jamming wearing quickly

I think It was mr J.S who suggested cutting the teeth with my vertical mill and then setting the head over and then doing the angle

4 end mills later (3mm ones) i had cut straight down (100 teeth)

1st question what depth of cut and speed and feed should a 3mm endmill be able to cut in MS?

I tried setting over the head but it was giving a dreadfull finish as the bit was moving rather than cutting

So i bought a gear cutter suitable for a rack

Thinking of ways to use it maybe mount a motor and gearbox on the mill spindle or a right angle drive

Made an arbour out of 1" ms and mounted that in the lathe mounted my precut blank in the toolpost and gingerley fed into the cut….perfect 2 different heights on the toolpost and job done in 2 hours doing 5 teeth at a time before moving the blank in the toolpost

Cutter was spinning at 210 revs…

2nd Q is that about right for a gear cutter 3" diameter hss cutting MS?

This was as I progressed so I had the moving steady supporting the arbour

turned the blank around and changed set up for the ends

this the finished rack and the original which is only 10 "long and a sealey one I bought which worked fine but didnt look too good

And this is it installed in the machine

I've motorised the bed…absolute luxury

switch gear mounted in a moveable box if it gets in the way it can move

Edited By Ian Parkin on 06/04/2016 17:35:01