MechMate CNC Router Forum

Go Back   MechMate CNC Router Forum > Personal Build Histories > MechMates already cutting
Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Reply
 
Thread Tools
  #91  
Old Sun 24 March 2013, 06:40
alan254
Just call me: Al #95
 
mystic ct
United States of America
Good morning,

I have read a lot on backlash and have no first hand experiance with it.

I was under the impression that I could program out the backlash with Mech 3. Is my thinking correct or not?

Or since I am in the just beging should I just pull the 36:1 gear box off the motor and go directly to timing belts in the same reduction range?

Al
Reply With Quote
  #92  
Old Sun 24 March 2013, 06:55
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
You can use the backlash compensation built into Mach to remove it. What it does is rapidly move in the opposite direction the amount you tell it before moving the rest of the axes. It is a little nerve racking to watch and will add time to the program. It would be better in my opinion to shoot for zero backlash and move on from there. I have removed and modified the gearbox motors to work on a belt drive but this is not an easy task. I can be done by not easily. The motor shaft is ground with a spline to adapt to the gearbox. Stepper shafts are extremely hard. I had a choice of grinding the stepper shaft down to remove the spline or use the spline to cut or broach the aluminum pulley. I opted for the broach method and used Loctite 480 retaining compound. But to press the pulley on it has to be controlled and a special pressing block must be made to hold the stepper back side of the shaft from moving inside the motor so you do not damage it well applying the massive force it requires to seat the pulley.

If the motor is unopened and unused, you may be able to do an exchange. You could try it and see how back the backlash is and if you can live with it. Backlash is a funny thing, depending on what you are doing it my not affect you. Wood is forgiving that way as it moves greatly with small amounts of temperature and humidity.
Reply With Quote
  #93  
Old Sun 24 March 2013, 06:56
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
Al,
Backlash sucks when it affects you, I can tell you that much.
Reply With Quote
  #94  
Old Sun 24 March 2013, 07:48
pblackburn
Just call me: Pete #98
 
South-Central Pennsylvania
United States of America
This is 0.0098" Backlash
Reply With Quote
  #95  
Old Sun 14 October 2018, 08:48
alan254
Just call me: Al #95
 
mystic ct
United States of America
Hi all it been almost 7 years since i finished building my machine and have had any problems with my machine till now.

The problem is my x drive motor it runs fine then it chatters and louses steps then it runs fine again. I have a new PK296A2A-SG7.2 motor and plan to replace it.

Many moons ago I read that if you are wired to half coil you are only using half of the motor and should there be a problem you can change to another winding. Am I correct and or was i dreaming. I have looked and can no longer find the thread i believed to have read.

Thanks Al
Reply With Quote
  #96  
Old Sun 14 October 2018, 11:58
alan254
Just call me: Al #95
 
mystic ct
United States of America
Also if i jog it slow it is fine If I fast jog it acts up Checked all wiring it's fine . I also ordered a new 203v
Reply With Quote
  #97  
Old Mon 15 October 2018, 11:33
alan254
Just call me: Al #95
 
mystic ct
United States of America
Found problem. One of the wires supplying the x drive in the wire e chain broke thru the insulation and was occasionally shorting to the outer shield of the cable. Replaced cable no problems in the first three hours of operation.
Reply With Quote
  #98  
Old Wed 17 October 2018, 10:50
Robert M
Just call me: Robert
 
Lac-Brome, Qc
Canada
Send a message via Yahoo to Robert M Send a message via Skype™ to Robert M
Humm...interesting, what brand cable is it ( was it ?!)
Later
Reply With Quote
  #99  
Old Thu 18 October 2018, 04:48
alan254
Just call me: Al #95
 
mystic ct
United States of America
This was used cable when i put it in. Now I changed all stepper wires with Southwire from Automation Direct Item code is MCTC-18-45-1
Reply With Quote
  #100  
Old Fri 19 October 2018, 07:15
IamDave
Just call me: Davey
 
Ball Ground, GA
United States of America
The first time that happened to me, on my other router. I spent a few hours scratching my head. It is not an uncommon problem. Especially, if you use your machine.
Reply With Quote
  #101  
Old Sun 21 October 2018, 05:54
alan254
Just call me: Al #95
 
mystic ct
United States of America
I gets used daily for almost 7 years now
Reply With Quote
  #102  
Old Tue 01 January 2019, 05:50
MarkRH
Just call me: Mark
 
Maryland
United States of America
Al what are you cutting mostly signs?, a spare wire would be a good diagnostic tool instead of searching for the break.I will be using mic cable until mine (not completed) earns its keep, and expecting to have issues with it.
Reply With Quote
  #103  
Old Tue 01 January 2019, 06:08
alan254
Just call me: Al #95
 
mystic ct
United States of America
i cut all kinds of stuff from full table pieced. A lot custom one off items to several hundreds of the same.

I just bought a whole reel of wire for spare parts.
Reply With Quote
  #104  
Old Tue 05 October 2021, 01:38
AlexTup
Just call me: Oluluron
 
AlexTupCN
Russia
Send a message via ICQ to AlexTup Send a message via AIM to AlexTup Send a message via Yahoo to AlexTup Send a message via Skype™ to AlexTup
-

Keyaki is the preferred wood for traditional Japanese tables, laquered to a shine that blinds. The wolod also is pretty expensive and getting scarcer every year. I have 5 or 6 slabs stashed away but havent found the time to work on them yet
Reply With Quote
  #105  
Old Mon 19 December 2022, 14:12
alan254
Just call me: Al #95
 
mystic ct
United States of America
Today my x axis stopped moving and the x is fine. I am using oriental motors and gecko drivers. The program Mech3 shows it is stepping on the screen.Should I try to change the gecko or the motor first . I have both. Or is there a better way to locate the problem.

Thanks Al
Reply With Quote
  #106  
Old Mon 19 December 2022, 20:04
obuhus
Just call me: Dmitriy #68
 
Kirov region
Russia
I had a very similar story on my plasma machine under Mach3. The machine is more than 8 years old today. Everything was working fine. Then it started to malfunction. Then the machine stopped working. I had to take everything apart.

Turned out to be a simple DB9-DB9 cable. One wire had fallen off in it! Only 1 !!! And the machine went down. Replacing the cable solved the problem.

I think you need to check the LPT cable, every wire. And everything around the LPT connectors.

Last edited by obuhus; Mon 19 December 2022 at 20:30..
Reply With Quote
  #107  
Old Tue 20 December 2022, 06:00
alan254
Just call me: Al #95
 
mystic ct
United States of America
Will look at that . Everything except the x axis it just keeps carving away only in a straight line.
Reply With Quote
  #108  
Old Tue 20 December 2022, 07:30
obuhus
Just call me: Dmitriy #68
 
Kirov region
Russia
I'm sure. You can do it!
Reply With Quote
  #109  
Old Wed 21 December 2022, 05:01
OBXCNC
Just call me: RC
 
Key West
United States of America
I have had this single axis problem with my CNC before and what solved the issue for me is tightening the screw/wire connections at the Gecko. I have found that at the beginning of every cold season, I will occasionally have this intermittent problem and going through the box and tightening everything seems to solve the issue.
Reply With Quote
  #110  
Old Wed 21 December 2022, 06:07
alan254
Just call me: Al #95
 
mystic ct
United States of America
Unplugged parrell cable from computer and controller cleaned and reinstalled reinstalled . Only had time to run a small project everything ran good. Will run large rojec this week will keep my fingers crossed.

Thanks Al
Reply With Quote
Reply

Register Options Profile Last 1 | 3 | 7 Days Search Today's Posts Mark Forums Read

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
New Z Slide Going In! #12 - Winter Park, FL sailfl MechMates already cutting 551 Wed 10 May 2023 20:32
Small Redwood Signs! Jayson The Show Room 3 Sun 09 August 2009 22:46
Fridge magnets and Signs Jayson The Show Room 0 Sat 13 June 2009 04:51
How to do Signs Lessons sailfl Miscellaneous / General / Whatever / Catchall 10 Fri 06 February 2009 04:03
Commercial Signs Hugo Carradini The Show Room 17 Wed 21 January 2009 22:51


All times are GMT -6. The time now is 21:09.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.