Member postings for JCC

Hi all.

I need to reduce a spindle diametre from 1 1/4" to 30mm (yes it's from a spindle moulder). I've got a rotary table and a chuck that I can mount vertically on a milling machine. The spindle itself is not very long (about 75mm). I've tried this setup to hold it and the measured run-out is 0.02 mm.

My question is: can I use this contraption and a milling cutter to do the work (revolving the rotary table when cutting)? Would it be better to mill from above or from the side? Can I expect a decent finish at the end?

thanks for any help

Hi.

just a quick followup to say that regrinding the angle worked out brilliantly. as a side effect the cutting tip is now more sharp. it's like cutting butter.

these boring bars do come less than sharp out of the box. I had not a clue.

it took a while to grind it since I only have a tormek (i'm a woodworker). i used the grindstone meant for hss planer blades.

thanks again

Edited By JCC on 23/05/2014 16:58:18

Edited By JCC on 23/05/2014 16:59:12

Hi.

thanks for the replies. good point about the clearance angle. I'll try to regrind the tip and see how it goes.

Hi.

I'm using a boring head to enlarge a hole in a aluminium pulley from 11.5mm to 12mm diametre. The goal is getting a tight fit on the shaft.

I'm taking off what I thought it was a small amount in each pass: around 0.1mm increments in diametre.

The cut starts ok but once the boring bar is cutting about 1mm deep into the hole the whole mill head starts vibrating noticeably. I believe the boring bar is flexing and not taking the material off.

I;ve tried to slow the Z axis feed but to no avail

The boring bar is carbide tipped and almost new, could it be that it is blunt already?

thanks for any help