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Any chance a snapamp will drive a 3 phase brushless DC motor of the Variable Reluctance type?

The motors in question ran off of a circa 1990's driver on a HV DC bus (~300V) had a coil resistance...

Thanks Tom, hope I didn't come off as an ass. I think you have somewhat talked down to me as if I were and idiot, which I'm really not. I have only seen brushless motors commutated off of the Hall...

OK Tom, while I'm still not really sure why we aren't just using the 3 hall signals, setting that aside where do I input the encoder offset number and once I'm done with that is the tuning just as...

What type of motor do you have?

Kollmorgen h344, 700W with internal hall commutation

Does it have differential encoder outputs?

No single ended but the cable run is short and I don't...

OK, I'll ask another question - has anyone successfully used a SnapAmp with a brushless motor??? So far the only documentation I have found so far is how to attach the 3 phase motor inputs. Zilch on...

I ordered a Kflop and Snapamp after reading this in the snapamp web page:

"SnapAmp works best with 1kW Brushless motors with differential encoders".

I was thinking if this was the best use...

I think I have at least one extra copy of the manual, but it won't help you except for teach mode without the software, which you can still get from Servo Source in KS. They will of course give you a...

Greetings - I am just now finishing converting my Logan Lathe to ballscrew and stepper drive for both axis. I have a plan to use touchy with an ELO 17" touchscreen to control everything. I have my...

I was referring to the World servo drives being bought out by another company. You don't tune a motor, you tune the drive running it.

When you go with a NEMA motor say a 34 or a 43 frame size, you have a maybe a choice of 4 shaft diameters - 2 imperial and 2 metric that are common to that frame size. Look anywhere for a servo of a...

I for one do not begrudge anyone charging whatever they think the product offering is worth. I certainly agree the DMM product is attractively priced. The problem is the motors aren't NEMA, and the...

The drive manual on the web site shows input only for the SPI encoder unless I missed something.

That was my plan - I was suprised to see the DMM drives do not use a standard quadrature input, instead they opted for an SPI serial encoder.

Looking into that DMM system, I don't think I want to go down that route. Looks like it is tightly coupled to their own motors which do not have a NEMA footprint. I Don't want to replace one...

I wouldn't call what I have now a real servo system. The motors have encoders and the scales (5 micron) close the loop on the table but as I understand it a variable reluctance motor is a derivative...

Thanks Troy - very useful information. As I said, I'd love to go full throttle with brushless servos, but my last experience with tuning sucked. The amps were made back in the late 90's, maybe things...

Thanks for the reply Tom, I guess I misunderstood the context of that manual section when I first read it. I assumed with all of the reference to stepper drive, well I took it literally as only...

I've seen the section of the manual that talks to glass scale feedback with stepper motors, and done some searches on the topic which lead me to believe that the only supported secondary feedback...

Got some time to do more work today.

http://i94.photobucket.com/albums/l116/scranage/side.jpg

The drain is the pipe on the left side, I just cut a rectangular hole which I'll put a piece of...

Great thread, thanks Unibiker for all the info and pics. I started my own build based on yours this weekend. I'm using a horizonal air storage tank from my last shop compressor that I recently...

If it's 6 more people it's $800 each. For 8 more people it drops to $600 each.

It didn't happen because we didn't have people sign up. It would take another 5-6 people to sign up and then we could schedule another date.

Interesting. I'm working on a derivitive. Check your PM.

Old Chevy inline 6 iron wonder?

Not sure if this is the best forum for this, apologies in advance if not.

Richard King has offered to do a class in scraping that I will host in my home shop just north of Colorado Springs if...

Title pretty much says it all. I have a Lagun FTV-2 that I had to replace the knee gib on. Lagun told me it would need minimal scraping on installation. Honestly, I gave it a go with some dye but...

No, Logan metric interposing gears are insanely expensive, money better spent on CNC conversion which is what lead me here in the first place. I did cut a sample 32TPI and checked it with a thread...

I have about 12" of ball screw I cut off, including a sample thread. But your point is a good one, 32TPI may be close enough. I'll give it a try and see how it fits!

Afraid there's no way to identify the source of the ball screw. All I know is it's hardened all the way through (good thing I have a toolpost grinder, carbide wouldn't touch it) and preloaded with a...

Nope, it really is M20x.8. With surplus ball screws you get what you get.