VFD conversion via solid state electronic components. PM1440GT, VFD, 3-phase

[B2]

Hi Folks, I just posted a new thread on finding all the possible TPI and FEED rates on my PM1440GT as well as on other lathes. If you are interested look here:

TPI Feeds X-Feeds: Generalized Excel file for your Lathe

 

[B2]

Hi Folks,

Re: PM1440GT VFD conversion Revolution Counter Circuit modification

Sometime ago I found that at high RPM my Spindle Revolution Counter would miss a count or two out of 10,000 etc. I found that this was due to excessive noise on the Hall Effect sensor signal line/ground when running at high RPM. I finally got a round to adding a simple pull up resistor to this line and this seems to have fixed the problem nicely. The attached pdf document shows where this was added in the front panel circuit board circuit drawing and in the board layout.

Dave L.