I am a retired engineer whose last hands on experience with metal machining was a metal shop course in '67. I have been following this forum for a couple of months now, and it has been a valuable source of information.

I recently purchased a PM 45 mill and a 1236 lathe from Matt, based on the positive reviews he has here and elsewhere, and after paying him a visit (with a stop at grizzly on the way). I rented a 600 sf industrial space in Montreal where I am setting up my retirement hobby workshop.

I have already installed the machines and started making chips. I have done a few mods, namely:

X axis table feed

3 axis DRO on the mill, (he did not have it in stock).

Spindle DRO on the mill, the z axis DRO is useless imho.

Z axis lift motor.

I would like to add photos, but I have not figured it out yet.

Today I will be receiving a couple of 2 HP motors and two Hitachi sj200 vfds and my question is, based on your experience what would be a safe maximum speed to run the machines. Would 120 hz, i.e double the actual speed be OK, or is there a risk of some thing flying apart.

I recently purchased a PM 45 mill and a 1236 lathe from Matt, based on the positive reviews he has here and elsewhere, and after paying him a visit (with a stop at grizzly on the way). I rented a 600 sf industrial space in Montreal where I am setting up my retirement hobby workshop.

I have already installed the machines and started making chips. I have done a few mods, namely:

X axis table feed

3 axis DRO on the mill, (he did not have it in stock).

Spindle DRO on the mill, the z axis DRO is useless imho.

Z axis lift motor.

I would like to add photos, but I have not figured it out yet.

Today I will be receiving a couple of 2 HP motors and two Hitachi sj200 vfds and my question is, based on your experience what would be a safe maximum speed to run the machines. Would 120 hz, i.e double the actual speed be OK, or is there a risk of some thing flying apart.

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