Thread: New to MyCNCuk
I have been making home made PCBs for some time and feel its time to automate the drill process with a small homebrew CNC machine.
I have the mechanical design in hand using a 10" x 10" table, I've bought 3 x 1.8 degree NEMA 23 1Nm Steppers from AstroSyn and am now looking at a suitable controller.
As its a PCB drill rather than a mill, with 0.7mm holes being the most common size I'm drilling, I thought I would get sufficient resoltion if I were to buy / build a controller that supports half step drive. While it sounds interesting to develop I don't think microstepping is needed.
I've looked at TOSHIBA TB6560 3 axis controllers on ebay, and also looked at schematics using MOSFETS and Driver chips.
Any advice, items to avoid and info on recommended designs to build is appreciated.
Hi peter, have a look at the units from Roy over at www.diycnc.co.uk/html/drv30_s.html, they are 3a drivers and very cheap. I think these maybe a good starting point for such a machine.
Stay away from the TOSHIBA TB6560 units from ebay, if you do a search on these forums you will read about the problems these units have.
Good luck with the build and welcome to the site.
Last edited by Lee Roberts; 27-03-2012 at 10:14 PM. Reason: Corrected the link :rollseyes:.Me
What you need is a low pitch ballscrew say 4mm or less, I recommend you don't try the cheap route and use threaded rod or cheap Acme screw and nut.!!
Because of the nature of what your wanting to do you'll need repeatabilty has much as resolution and threaded rod and cheap Acme which usually come with rubbish nuts which just can't give you what you'll need.
http://www.rockcliffmachine.com/ plan I'm using 6mm stainless machine screw with a nylon nut. I'll plan to run some tests to check repeatability now I know what to look for. I should be able to upgrade to a ballscrew if its an issue. Cheers Pete
I have a DIYCNC system 4 set with 4 of the 3A driver boards and the case. If you are interested give me a pm and we can chat. Also have four of the ext module cards that can go with it if your interested.
Last edited by m.marino; 28-03-2012 at 04:02 PM. Reason: Corrected a mistake on the driver cards value
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