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Not sure if this is the correct sub-forum to post this. Let me know if I should post elsewhere.

Looking for a supplier of decent quality ballscrews and zero backlash ball nuts. I bought a couple...

Does anyone have a recommended source for 8 mm ball screws (ground or rolled OK), matching ball nuts and end mounts? I need lengths of roughly 550 mm. I can probably go up to 10 mm, maybe, pushing...

While this is all true, there's nothing wrong with making the effort to build a better system. As more loads are placed on an air system there could be issues. Back when I had a VF3SS with side...

I am installing one of these rigs between my compressor and my Haas VF2:

https://www.mscdirect.com/product/details/42008185

The compressor (a 20 gallon unit from California Air Tools) has a...

Thanks for the info. I just got a Bridgeport Series 1 with a 2J head and 9 x 48 table. I"ve been doing research for a few weeks. My conclusion is that dropping $15K into these machines by the way...

Bill, which motors did you select? I am looking at these right now for a conversion. They seem really nice and simple to use.


Thanks,

-Martin

The motor was $100 on eBay. It's a blower motor. Not inverter rated.
I got the WJ200 here:

https://www.driveswarehouse.com/p-2527-wj200-022sf.aspx

7/8 shaft. I had to buy a new stepped...

It's been going slow due to a few stumbles and not having time. I finally got the new 3 HP 3 phase motor and WJ200 VFD installed and running.

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That VFD manual sure is a bear to go...

Just looked at the Wiki page you pointed to and did a bunch more research. Frankly, it sounds easy. A quadrature encoder and index pulse on the spindle (or motor) isn't that hard to do. For some...

I looked at LinuxCNC a while ago. Not sure why I stopped considering it. I'm perfectly comfortable with Linux.

Would you happen to have any links to rigid tapping implementation examples?

...

Here you go:

McMaster-Carr

Also, if you search McMaster for "timing belts"


-Martin

You are reading my mind. I am thinking about rigid tapping. Although all indications are that Mach 3 doesn't support it. I'll deal with that when that bridge comes up.

I also found these belts...

New motor stepped pulley.

Rather than try to ream out the existing pulley I bought a balanced 7/8 bore pulley from these guys:

Beaumont Metal Works : 4-3-2" Step pulley with a 7/8" bore : KMG...

Starting to research options for doing a single belt mod to my RF-30. This won't happen for a while but since I am researching pulleys and belts for my current rebuild of the machine I figured I...

What belts do you like to you on your RF-30 and why?


Thanks,

-Martin

OK, thanks, I'll look for that today and report back.


-Martin

OK, got my VFD (Hitachi WJ200, 2.2 Kw) and 3HP 3 phase motor (got it for just under $100!).

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Holy cow, that Hitachi manual is a mess. I have to say, typical Japanese cryptic...

Yup, that's basically what I am looking to build, times 2. In other words, both ends would be floating in order to do 2 plane balancing. Also, since I want to be able to balance the rotor out of a...

Thanks. You are right, of course.

-Martin

I was looking into that. There are some cheap yet seemingly high quality bearings for skateboards. Not sure what their limitations might be though.


-Martin

I am looking into building a dynamic balancer for rotors. Something like this:

Erbessd Instruments - High-precision & high-quality Balancing Machines

Obviously the bearings that support the...

Here's an interesting video. Pretty much a big brother version of the hobby propeller balancer with a motor and sensors added:

https://www.youtube.com/watch?v=VKr5RZt6MQo

Gotta love the guy...

Yup, 'been flying model airplanes since I was a kid (and helicopters as I got older). I have exactly that prop balancer and have used it many time. I was eyeballing it for ideas. The key, aside...

Yes, I figured out that when balancing the rotor on the motor you have to account for the missing "half key" on the shaft. Same for the missing key material on the pulley.

It's amazing how some...

Thanks Art, that's what I'll do.

Trying to figure out how to balance (or check balance) on the pulleys. I've seen pictures of RF-30 pulleys with balancing holes drilled on the bottom. Mine have...

Well, not much has been done since I had to deal with motor issues. I went back and forth a couple of times. After rewiring the motor and contactor for 220V operation something went pop in the...

Happy to say that my single phase motor is OK. I somehow made a mess out of converting from 110V to 220V. With the motor on the bench rewired and tested for straight 110 and 220 and all is well. ...

I was starting to research the difference between inverter rated motors and regular folk.

Yeah, I was wondering about the WJ200 being able to go up to 400Hz. Probably not kind to motor and...

Ah, makes sense. Need to put on my thinking cap. I know this stuff!

Must have more coffee. Must have more coffee.


Thanks,

-Martin

Would you go with a higher RPM motor as well? In other words, 3HP and 3,600 RPM max?

Looking at a Hitachi WJ200 drive. They seem to get solid reviews everywhere I look.


Thanks,

-Martin