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Messages - garyhlucas

241
General Mach Discussion / Mach 3 lathe with stepper spindle
« on: January 26, 2017, 07:02:45 PM »
Can mach 3 lathe drive a stepper motor continuously as a spindle?

242
General Mach Discussion / Re: PLC Tool Changer Help. Where to Start?
« on: January 16, 2017, 01:03:15 PM »
To go a little further, one more bit gets you 32 tools. An additional bit can give you parity checking to guarantee data transfer. Also if the changer is rotary you can determine position the same way  with 4 or 5 switches and do a simple compare to know which tool you are on.

243
General Mach Discussion / Re: PLC Tool Changer Help. Where to Start?
« on: January 16, 2017, 12:08:58 PM »
Sometimes brute simple is best. If you have 4 outputs on the CNC57 you could output 4 bits binary to the click for 16 tools. One bit back to Mach 3 to say task is done

244
Try this document

245
G-Code, CAD, and CAM discussions / Re: Parabolic Dish
« on: January 11, 2017, 08:11:15 PM »
No idea why you would use an 1/8" end mill to finish a surface with a huge radius after roughing it with a 1/4" end mill.  The 1/8" end mill will produce a far rougher surface and take forever to do the job.  You ought to have used the 1/4" with a smaller step over for the finish, or even better the largest radius cutter your spindle can turn at a light depth of cut.  The finish could be really smooth that way.

246
3 HP is the 2.2Kw drive from Hitachi for single phase or 3 phase 240v input.  No one actually makes a larger single phase imput drive that I can find. After 3 hp you use a 3 phase drive on single phase by derating 50% so a 5 hp motor needs a 10 HP drive and the cost goes way up.  The reason is that current on the diodes and filter capacitors is low when converting 3 phase to DC.  Converting single phase the current is much higher and the ripple is huge.

247
I've worked with AB drives for 12 years.  Not impressed, lots of drive failures, and you can have their PLCs and paid tech support too. A braking resistor need not be any thing special.  Often they are just a big wire wound resistor with a specified wattage and resistance.  Lots of surplus choices for that I would think.

248
I have 14 wj200 drives installed right now. I had a modbus question and called tech support at (914) 524-6720 and spoke to Mike. Very knowledgeable about this drive and gave me the right answers. I suspect you are regenerating during decel and causing a dc buss over voltage. That is what a braking resistor is used for to dump the excess power during braking.

249
Tangent Corner / Re: Whoops !
« on: January 05, 2017, 08:01:01 PM »
That's gonna leave a mark!

250
Tangent Corner / Re: Larning th hard way.
« on: December 31, 2016, 03:14:12 PM »
My shop vac has a cyclonic separator between the vac and the hose. Most of the tools and parts I suck up are sitting on top of the pile in the separator instead of in the bag with the fine particles!