Machintek has always been the human encyclopedia of bridgeports, hopefully he can help me again this time, Edited: looks like he hasn't been on in many months, hope all is ok. Maybe someone else has the info, lots have done belt conversions on varispeed heads.
I have a old Boss 3 (tilt/nod varispeed head) that has been totally retrofitted and brought up to date. I have a VFD running the stock varispeed head which is driving me crazy with the noise especially at 5000 rpms.
Well, I have had enough ! I ordered a set of poly V pulleys to swap out the varispeed setup. The pulleys are taper lock type
The question is : Do yu know the shaft sizes for front and rear so I can order the taper lock bushings ahead of time?
Any idea lwhat the center distance on the shafts is? I would like to order the belt at the same time.
Last, please confirm that 6000 rpm is ok with the new setup, what about 6500? more? I use a lot of 1/8 and 1/16 endmills and speed is king.
Thanks much !
George
PS 4 pole motor 17xx rpm, 1.722 belt ratio, so at 120hz/3600rpm I should be at 6200 rpm, give or take a bit.