This list is for the discussion of CNC and related topics including CAD, CAM, EDM, & DRO. The list focuses on the construction of home shop CNC machines along...
CAD_CAM_EDM_DRO@yahoo...
Oct 1, 2007 8:34 am
93875
... in ... How are they lacking for a power feed unit? A DC motor will precisely repeat the same speed in both directions. A stepper motor is overly...
I would have to disagree. A simple DC motor, even with a speed control, will slow down under a load. A stepper motor is the only kind of motor that will ...
<snip>Has anyone out ... I've thought a lot about this very problem, and I have the answer. I'll describe it here because I'm too lazy to draw a picture, but I...
... DC motors with variable resistors or voltage feeds still do not hold constant speed with varying torques. The feed may change with load resulting in a...
... How much variation in torque would you expect on a 9 x 12 lathe? A slight slowing of speed during a facing operation( X axis) would be perfect for a power...
I just tried something that worked amazingly well. I put a piece if teflon tape into a Delrin nut that had a very slight bit of backlash. Works Great! It...
Yes - BUT a DC servo motor with an encoder is better than both !! Dave _____ From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On...
Dave Fisher
dave@...
Oct 1, 2007 7:03 pm
93882
I'm going to run some tests with the 555 timer. Though it doesn't support ramping, I'm not sure I need. It looks like a few components. This may just hold me...
You can do a ramp with the 555. You need a relatively large resistor and capacitor to do it (since the time constant needs to be around the ramp time you...
... And the PID controller is much more expensive than a similar stepper controller. This is a case where you get what you pay for and the costs show up not...
... but ... code ... I got the 555 timer chip to work, and it works real good. It will ramp automatically, by way of the trim pot. Ideally, yes it would be...
Hi, ... If you join the Eleadscrew group, http://groups.yahoo.com/group/E-LeadScrew/ You'll find the source code for the first Rev of the ELS proving the ...
... Yes I have a pic programmer & compiler as well, I can use pic chips but started using the AVR since it appeared to be more popular in terms of samples and...
You can also order a copy of my November 2006 article from www.crcuitcellar.com that gives an overview of the process taken to develop the code posted. The new...
Dear All, I have recently converted my Denford Orac lathe from Parker CD20 to Gecko 210 stepper drives. The lathe is driven from a laptop PC using TurboCNC...
Hello Thomas, I use an old 200MHz Toshiba laptop with TurboCnc 4.x to run my Sherline 5410 (metric 5400) CNC mill. TurboCnc requires DOS mode. You must boot up...
Dear Tom, It's an old Tosh as well running in DOS, there is no Windows on the system. Also the jog speed is quite low, say about 50 mm per minute. The...
I am close to mounting 2 servos that will drive my large gantry, I am hoping I can bench tune them before mounting my theory is that since reflected load at...
Usually the factory setting for the Gecko G320's is pretty darn good. If those are the servo amps you are using. I have set up other servo amps and bench...
Hello Dan, thanks for input how are things in Bothell?[I'm in Bremerton we spoke once on the phone ,in 97 I think] I am not using Geckos this time,Teknic...
I use to carry the sst1500. They're pretty nice. It's been a long time since I played with them but YES I would definitely tune those servo amps with those...
Dan the E-divide is "divides" the quadrature counts coming from the encoder to the drive, in my case instead of needing 8000 steps per mtr rev, I can divide...
Hi all, I have been thinking for a while now that there needs to be a group for the cnc related small business to offer support and advice for each other. Also...
I'm all for it, as I just recently started my own little SHOP of Horror's. Any and all info would be nice to hear. Smitty ... From: John Hansford To:...
... In the past this group (CCED) has focused on the actual building of HSCNC (Home Shop CNC) machines. We have considered topics of what you do with the...
