Messages

1

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 11, 2015, 05:55:34 PM »

Ok not meant to be ebay spammy here but poking around all day for different deals and came across and AC servo with 4NM and a driver from china that seems quite decent for the near 500usd price.  Cool thing about this driver is that its power supply is 220 240 which means for me no additional power supply needed and should be pretty easy to hookup.

I just asked them for the curve sheets and data now..will post it when I have them if anyone is interested.

http://www.ebay.com/itm/271735479951?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

2

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 11, 2015, 02:50:56 PM »

keeping my eye out for a bargain

http://www.ebay.de/itm/Rexroth-Servomotor-MSK060C-300-NN-M1-UG1-NNNN-/391015965804?fromMakeTrack=true

3

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 09, 2015, 05:35:54 PM »

For example here is a small 30cm robot I made a little while back on my bf20l converted to cnc

http://adamdonovan.net/files/Adam_Donovan_Work_2_Multiplexing_Tautophone.html

4

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 09, 2015, 05:31:56 PM »

My 4th axis I guess at the moment is planned for a wide variety of work.  The initial stuff im doing is small diameter 1/2 inch with lathe operations and some 4th axis milling with slitting also.  Gears and timing pulleys I want to do as well as some special collet making for carbon fiber robot arms say up to 20mm.  Ill add another independent linear rail latter for small hobby servo internal splines as a type of shaper operation after general lathe milling to hold bearings so that its all as an inline operation as I can get. 
I built medium sized robots and parts for artworks

5

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 09, 2015, 05:14:42 PM »

thanks sound advice and solves my hum har about the steppers. 
Ive been thinking a lot about your awesome brake and how and if you can actually calculate "drag" for continuous milling?

6

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 09, 2015, 04:41:21 PM »

I do have a few older electrocraft e240 motors with some heds encoders but may be a bit less torque with these

http://www.ftp.cnchungary.com/Varsanyi_Peter/CNC%20vezerles%20-%20szervoval/ElectroCraft_E240_Motor/electrocraft%20E240.pdf

7

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 09, 2015, 04:04:23 PM »

Thanks mike,
                  I have also got a new harmonic drive for this project but was thinking it probably wont be any good for any fast spindle work. I will probably use the HD mounted to the back of a vertex 6 inch rotary that I have to do some pretty precise work. 

I would have thought that a stepper can actually spin pretty fast if programmed correctly though perhaps im wrong there.

Any chance you know what servos Simpson is using anyway so I can spec things out a little more?

8

Show"N"Tell ( Your Machines) / Re: Success! Mini Machining Center under Mach3 control - Video link

« on: January 09, 2015, 03:22:47 PM »

I am in the middle of refurbishing an old lathe headstock to use on my bf20l/grizzly to be my 4th axis/  So far the mechanical side of things is pretty easy going with a few replacement bearings for the headstock and probably a 6:1 or 8:1 timing pully setup. 

I've been wondering how you might think a nema34 stepper would go instead of a servo drive?  Simply the price is the attraction not to mention I can get one with about 11NM of torque.  I cant seem to find any servos anywhere near the price range of around 200 USD that the stepper would be(including the driver and power supply). 

I actually thought about using a MTB disk brake with a small ball screw to  adjust the drag/brake.

Anyway these are things I am mulling over now perhaps let me know if you think there are obvious problems I may be over looking.
Ive given the link to the specific parts im looking at on ebay at the moment anda  pic of the headstock to make this more interesting



http://www.ebay.co.uk/itm/201217825668?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

http://www.ebay.co.uk/itm/261449060712?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

9

General Mach Discussion / Re: Stepper Motor slow down then speed up along curves/arcs

« on: February 10, 2013, 05:02:59 PM »

by baudrate I mean the serial output settings under the gerneral tab..or does this mean nothing for me in this case..I somehow thought that they were related.
Its was just there as information in regards to my system specs,  In some other robot projects we have increased the baud rate to improve some servo response times and I thought it may matter here.

And just so there is no confusion about it I am using a parallel port

10

General Mach Discussion / Re: Stepper Motor slow down then speed up along curves/arcs

« on: February 10, 2013, 03:48:00 PM »

sorry 1 to many 0''s in the baud rate its meant to be 9600 8 bit 1stop
Ill have to get the xml and gcode file in the morning as im not in the workshop anymore (its 10pm in Sunday  Austria)

edit: I think also I will do a quick video tomorrow as well as upload the files and the rest of the system.