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331  Mach Discussion / General Mach Discussion / Re: BT30 spindle from scratch - with power drawbar and ATC of course on: October 06, 2012, 06:21:35 AM
Hi Dave,

The BT holders have two flats at 180 degrees which engage with keys on the spindle. See photos earlier in this thread.  In this one you can see the seats for the keys on the spindle:

http://www.machsupport.com/forum/index.php/topic,22080.msg155852.html#msg155852

And this photos you can see the f;ats on the holder:

http://www.machsupport.com/forum/index.php/topic,22080.msg154764.html#msg154764

Dan
332  Mach Discussion / Mach SDK plugin questions and answers. / Re: Impact engraving plugin on: October 06, 2012, 01:13:55 AM
Hi,

I think Tweakie has once mentioned this to me. But I still don't understand this, since as we know the current change rate on a coil is described by:

  i(t) = I0-(R/L)t

So only depends on the inductance...?

Dan


333  Mach Discussion / Mach SDK plugin questions and answers. / Re: Impact engraving plugin on: October 05, 2012, 01:22:36 PM
Can you please clarify how the higher voltage helps in increasing the oscillating speed?

Dan
334  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 1997 DYNA MYTE DM4800 VMC to Mach3 Conversion on: September 29, 2012, 12:13:05 AM
Love watching your work!

Dan
335  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Chiron FZ12 on its way sometime soon(ish) on: September 27, 2012, 03:47:18 AM
I think you're right. Just wasn't willing to mess with the motors. But looks like it would be much cheaper and eliminate another electronic board in the chain, reducing chances to further troubles.

I too often find international postage prices being irrational. Sellers often work with a single freight company and aren't willing to check other options even when it's obvious that the price they are being quoted is way exaggerated.

However, I googled for commutation encoders and came up with a much cheaper one from US Digital with technical specs same as the Renco:

http://usdigital.com/products/encoders/incremental/rotary/kit/EC35

And it's priced almost half the Renco, at $161.

Dan
336  Mach Discussion / General Mach Discussion / Re: Allen Bradely drives to Sanyo denki motors ? on: September 26, 2012, 03:01:22 PM
Using a scope to verify the phasing, like Hood suggested is the best way.

Dan
337  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Chiron FZ12 on its way sometime soon(ish) on: September 26, 2012, 02:49:33 PM
Hood,

On the previous subject of the resolvers on the motors, what is your opinion on using one of these:

http://www.vegacnc.com/html/vega2795502.htm

It's not cheap, but cheaper than replacing the motors I reckon. There are other vendors too offering such converters cheaper, but some have lower line count or miss the hall signals. This one has 8192 ppr, but from what you've shown, I am afraid that even this may not be sufficient to get good performance.

Dan
338  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Chiron FZ12 on its way sometime soon(ish) on: September 24, 2012, 01:49:52 PM
SCARY numbers! Shocked

Dan
339  Mach Discussion / General Mach Discussion / Re: Allen Bradely drives to Sanyo denki motors ? on: September 24, 2012, 01:45:33 PM
You've got Hood here, Terry Wink Can't think of someone with more experience with AB drives around here.

Dan
340  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Chiron FZ12 on its way sometime soon(ish) on: September 24, 2012, 12:52:30 PM
They are AC.

Serious beasts indeed at 220Amps... Sounds more like a TIG welding machine spec than a servo's  Shocked Continuous current was probably around 70Amps and hence the power in access of 6kW... WOW! Probably were high RPM and low torque.

Dan
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