Bridgeport Manual to CNC conversion...

[Boyan Silyavski]

I remember when once was looking into that, that there were encoders that could count straight from the HTD pulley teeth. though there was some limit on the speed, but i think you are in. Though cant remember more for them right now

[Davek0974]

Probably, i already have the encoder though ;)

[m_c]

Read the installation requirements for the encoder.
Depending on the style of encoder, there are different installation requirements.

[Davek0974]

Thanks, was just looking for ideas - the encoder is a rugged little unit with self-supporting shaft capable of something like 15N radial loading which is pretty tight for a belt.

I'll try the motor shaft idea first as i have the bits for that, if i need pulleys i'll have to order some up.

[m_c]

You'll probably want some kind of flexible coupler for that style of encoder, as unless you can guarantee very accurate alignment, you'll likely kill the encoder pretty quickly.

An encoder with a separate disc/reading head would of been a better choice for mounting directly onto a shaft.

[Davek0974]

Thanks,

I have seen the actual encoder body mounted on a spring plate presumably to allow for small misalignment

I will get a flex coupling in there.

[Davek0974]

Well, the motor was fitted, the pulleys wouldn't turn so something was wrong, then i discovered the rib that was cast into the top housing cover was rubbing badly on the top of the belt edge :(

Off it all comes again, rib was duly altered with a grinder ;) all back together again and nice smooth movement this time, my measurements and belt length calculations were spot-on and the adjuster slot on the motor plate was mid-way when tight. :)

Lugging a 3Hp motor up top on a Bridgeport on your own with only a pair of steps is no fun, doing it twice was pushing the limits a bit ;)

Just got to fit the VFD, wire up and we should be good.