$30 RPM Improvement for LMS3900

I did a simple belt and pulley change on my LMS3900 to increase the max RPM to approx 4,150 (don't have my tachometer yet) from the 2,500 stock. Thought some of you may be interested in trying it as well.

No machine modifications required.

Total cost around $30
Parts are from https://sdp-si.com/eStore/
PN: A 6A25-032NF1508
PN: A 6R25-M077150

See PDFs attached

GG67

** Disclaimer**
I've made this change but do not have a lot of time running the machine with it to gauge long term bearing life but I'm willing to take the risk for improved RPM and change/upgrade bearings latter if needed.

Thank you for taking the time to posting the info!

Just a quick update, I've run the machine for about 2 hours continuous at full RPM with this set up and have not had any issues. The casting gets warm but does not seem much worse than with the stock pulley combo. This was just freewheeling not under load.

GG67

GG67 how is the setup working? No problems? I would like to make the upgrade.

Working great, I've had no problems and have done a lot of machining with it.

GG67