Torque / Speed curves for different Spindle Types

[andy_con]

yeah i regulary use a 20mm end mill just to get lots of meterial away at once then switch to a smaller cutter for final finish. i had a massive problem with my sem motor, smoke the lot. the rpm keep jumping up and down by like 500rpm when running. ive installed sinplde feedback into mach.

so i recently sent the motor away for repair, cost me £500 but it has been working very good since the repair. the brushes on mine looked fine but there was clealy another issue.

mine is bt35

8k with some decent torque would be ace. things like this pop up on ebay regulary, but its trying to find out the exact spec of the motor thats the difficult part -

http://www.ebay.co.uk/itm/Parker-Aut...#ht_881wt_1395

ive also been working on a 10 station atc for my triac, it currently only has a 6 station

Thanks. Maybe my feeds are a bit too agressive but wow 20mm, thats a lot.

It looks like my controller has died. Ill probably just get a newer version of the controller and then look at the high speed spindle options later. My brushes still look OK, perhaps a bit worn, looking to find some replacement ones to be sure.

Is your machine the same as mine? BT30 or 35? Mine is BT30. A good rpm speed is around 8K I think. So take the 24K Chinese spindle and gear it down by a factor of 3. I think that will give a good balance for speed / torque.