The Shop > Tools
Isel CPM3020 cnc machine - electronics rebuild
John Stevenson:
--- Quote from: philf on January 14, 2016, 08:06:29 AM ---
--- Quote from: PK on January 14, 2016, 05:25:00 AM ---At this scale, IMHO, it's hard to go past the G40 http://www.geckodrive.com/geckodrive-step-motor-drives/g540.html . Mainly because of the amount of fault protection it offers, but also because it's pretty much a drop in replacement for what you have...
--- End quote ---
The downside with a unit like the G540 (other than price) is that it's not modular so if one component goes down the whole lot goes down. On the other hand it saves a lot of wiring and Gecko drives generally get good press.
Is it not possible to get the existing controller up and running?
Phil.
--- End quote ---
Phil, they are modular, they hold 4 G250 drivers and you can swap them.
Only problem with these is by the time they get into the UK duty paid they are bloody expensive for what they are, a 3.5 amp drive which will be happier at 3 amp.
You could buy a USB breakout board and three 4.5 amp drivers for half the money.
More scope to use modern computers and a derated 4.5 amp driver is going to be far more reliable that a driver running at max.
philf:
--- Quote from: John Stevenson on January 14, 2016, 08:35:09 AM ---
Phil, they are modular, they hold 4 G250 drivers and you can swap them.
Only problem with these is by the time they get into the UK duty paid they are bloody expensive for what they are, a 3.5 amp drive which will be happier at 3 amp.
You could buy a USB breakout board and three 4.5 amp drivers for half the money.
More scope to use modern computers and a derated 4.5 amp driver is going to be far more reliable that a driver running at max.
--- End quote ---
John,
Sorry - I thought it was an integrated control.
You're right - 4.5A drives are as little as £21 on eBay from China. (Just got to hope you don't get clobbered for VAT and the collection fee).
Am I still right in saying that you can't run a USB breakout board with Mach3? I know you can use a USB SmoothStepper but they don't come cheap either.
Phil.
raynerd:
Hi, interesting posts. Sorry, but I'm staying away from Geko, they are just too costly especially with import and shipping. I'm sure they are good but can't see the benefit above 4.5a drivers or even a branded Leadshine DM556. Shine, these above nearly doubled since I lost got some...sure I paid £35-40 per drive from Arc Euro about six years ago.
It's a minefield but there is a lot of talk about motion control. Has anyone used these CSLABS I-PM
It's a heck of a price as well but MY UNDERSTANDING (!?) is that it acts as motion control and BOB all in one as is very good quality.
http://www.cs-lab.eu/en/produkt-18,2-CSMIOIPM_4axis_Ethernet_Motion_Controller_stepdir_with_connectors.html
Just to confirm, I need stepper drivers x3, motion control (or free parallel port!) and a bob to get this to move. Or I just need 3x drivers and then the CSLABS ip-m.
The PSU is 24.5v so I guess I can use this or should I really swap this out for 36vdc??
Ahhhh remember my last cnc build now. Heads going to explode.....
philf:
Chris,
Since my last reply in which I asked about Mach3 with USB I have found two USB offerings from CNC4YOU both compatible with Mach3:
https://www.cnc4you.co.uk/Motion-Control
One looks like a USB to Parallel Port adaptor but it's a lot more than that and takes a lot of work from the PC by reading in the code and then dishing it out to the CNC. This might mean it would work OK from a laptop. I think you'd still need a BOB with this one.
http://cncdrive.com/MC/UC100%20datasheet/UC100%20users%20guide.pdf
The second looks more advanced and gives 36 outputs and 49 inputs + 2 analogue inputs + 2 analogue outputs and can handle 6 axes. You wouldn't need a BOB with this. [Edit: The manual says you should use a BOB with opto-isolation to protect the inputs. The stepper drivers usually have opto-isolation on its inputs.]
http://cncdrive.com/MC/UC300%20datasheet/UC300%20users%20guide.pdf
I bought all my drivers and motors from CNC4YOU.
Looks like they are available from elsewhere and good reports on both on the Machsupport forum:
www.machsupport.com/forum/index.php?topic=25448.0
Cheers.
Phil.
raynerd:
On one of the cnc forums someone is really plugging the digital stepper drivers. Apparently the ones you linked to are analogue. However, for the extra money and the ability to buy them from the UK - I`ll go with the ones you suggested if you have been happy with them? I`d rather buy UK - estimated delivery for most China buys are between 6th and 28th Feb!
Any one else used the cnc4you 4.5A drivers or alternatives?
Chris
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