Search found 48 matches

by jpmsteadi
Tue Jul 06, 2021 8:16 pm
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor Recommendations
Replies: 25
Views: 1812

Re: Spindle Motor Recommendations

Hey Jerry, I am enjoying the new motor. It is night and day from the old one. I would say that as long as you aren't pushing the new spindle much faster than the 4250 rpm rated stock the stock bearings are probably fine. I ran them for a bit, but on longer ops at slightly higher RPMs they were getti...
by jpmsteadi
Sat Jul 03, 2021 7:25 pm
Forum: Success Stories
Topic: PM728VT - Success in Progress
Replies: 4
Views: 1017

Re: PM728VT - Success in Progress

Another little update, put on the bigger motor, changed the spindle bearings, and it's working beautifully. Been pushing the rapids and have gotten very happy with it all.

by jpmsteadi
Sat Jul 03, 2021 7:07 pm
Forum: Centroid Acorn CNC Controller
Topic: Zero position for bar feed location on lathe
Replies: 30
Views: 770

Re: Zero position for bar feed location on lathe

Another option is to add a G0 to the end of the program that puts the tool to the proper location at the end of the previous part. I'll do this when I have to probe a part on the mill. Makes sense to do it at the beginning of the program for the lathe I'd think unless you do a cutoff beforehand (whi...
by jpmsteadi
Sat Jun 05, 2021 10:31 am
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor Recommendations
Replies: 25
Views: 1812

Re: Spindle Motor Recommendations

For sure! It is a 3450 nameplate RPM motor. It is inverter rated, I am running it at like 78hz to get that 7k rpm. It has a 1.62 ratio pulley on it, so when the spindle is at 7k the motor is only spinning 4350 rpm, so not too much over the nameplate. When I bought it the ebay ad said it was rated fo...
by jpmsteadi
Fri Jun 04, 2021 7:47 pm
Forum: Centroid Acorn CNC Controller
Topic: Spindle Motor Recommendations
Replies: 25
Views: 1812

Re: Spindle Motor Recommendations

I just got back home this past Saturday and I was excited to dive into the spindle motor upgrade. I had seached eBay for quite a bit while I was away for work and ended up with a used like new marathon 2hp motor and an FM50 2hp single phase VFD. Thankfully I got quite lucky with the motor and the pu...
by jpmsteadi
Wed May 05, 2021 3:24 am
Forum: Centroid Acorn CNC Controller
Topic: Mill Choice PM-728VT or PM-833VT
Replies: 5
Views: 461

Re: Mill Choice PM-728VT or PM-833VT

Richard, I own the 728VT but have not see the 833 in person. I have seen some videos of a conversion to that as well. I would say that the 833 is the better choice if you think you might be doing anything but aluminum. The 728 does have a slightly faster max spindle speed, which is handy for small t...
by jpmsteadi
Mon Apr 12, 2021 8:06 am
Forum: Centroid Acorn CNC Controller
Topic: 2007 Shopbot PRS-S 4896 Upgrade Recommendations
Replies: 10
Views: 1211

Re: 2007 Shopbot PRS-S 4896 Upgrade Recommendations

The options are really wide open when considering the motors and drivers. Since the acorn outputs step and direction signals any device that takes those in can be used. Anything from dirt cheap amazon/ebay stepper kits to clearpath or DMM servos to other strange things. If you are happy with the spe...
by jpmsteadi
Sat Apr 10, 2021 6:12 am
Forum: Centroid Acorn CNC Controller
Topic: Clearpath SDSK-3421S-RLS Wizard Settings
Replies: 3
Views: 315

Re: Clearpath SDSK-3421S-RLS Wizard Settings

I would also say that you will need to make sure the motor steps match in the acorn wizard and in the clearpath app. The input step resolution can be higher on the regular 800/rev, the motor just will take 4 step signals for every unit of motion it is able to command. Won't be an issue at all, just ...
by jpmsteadi
Sun Apr 04, 2021 4:29 am
Forum: Centroid Acorn CNC Controller
Topic: AXYZ 4004 Retrofit
Replies: 11
Views: 875

Re: AXYZ 4004 Retrofit

looks like it will be great!
by jpmsteadi
Wed Mar 31, 2021 2:01 pm
Forum: Centroid Acorn CNC Controller
Topic: Is a stepper driver necessary?
Replies: 3
Views: 270

Re: Is a stepper driver necessary?

of course!