Thread: A sufficiently strong machine
Fantastic build Jonathan, many thanks for posting
Great looking build Jonathan, a real work of art.
I'm only about half way through the first post, can't wait to finish reading it.
Thank you for the comments so far.
HEDS-5500#A06 - AVAGO TECHNOLOGIES - ENCODER, ROTARY, 500PPR, 2CH | Farnell United Kingdom
Part of the reason we had to put a PCB with the encoder was because the cheap one from eBay lacked the index pulse. If you're feeding the signal into the parallel port (e.g. to implement PID loop with linuxCNC) then the frequency needs to be reduced anyway. Sasha's just using the standard cheap Huanyang VFD.
Apart from that, no there's nothing else involved - it's a really easy process compared to the other options.
Last edited by Jonathan; 31-08-2013 at 11:06 AM.
I have another question about your design.
The holes on the steel are for moving the bed up and down? So, how will you keep the original parallelism of the rails that move the gantry, shimming every time? Or using the supports i see on one of the pictures and shimming and adjusting in vertical position connecting the table to the supports instead directly to the steel frame?
About the epoxy. You mentioned the brand. Where did you get it from? Abroad? How much epoxy was used? I have to do this very soon.
Just to be clear, changing the height of the bed only affects the parallelism of the rails with respect to the bed. The measurements of rail straightness (and twist) we took effectively subtracted the error due to the non-parallelism of the bed, as once the bed is skimmed using the machine this error will be largely eliminated.
Clive S where he got his as he got some much more recently than I did. The company 'Desperate Measures LTD' quoted £24.48 for 1kg of resin and £17.61 for the hardener to go with it. I think those prices do not include VAT, but I'm not sure.
I think we used about 600g of resin - I can't remember exactly. You can work out what mass of resin you need by just working out the volume (remember to include the bridge across the middle) and multiplying by the density they quote. About 4-5mm thick should be plenty.
Thats some thread mate,well you know im a fan of this machine,i saw it being built at various stages i used to stand there in awe lol just staring at it,its so busy,well done lads.
you could not have timed this better for me, am just about to start a build. I want quite a heave duty machine for milling stone/ally
Question. Would there be a benefit from using larger motors Nema 34s or 42s or might it be a problem
You would have to be building a huge machine for Nema 42 motors to be the correct choice. See this thread for a more detailed explanation.
The Following User Says Thank You to Jonathan For This Useful Post:
thanks, am reading that now. Brilliant stuff.
I have another 2 questions or request for your opinion.
1. To stiffen up Z and Y ( when in action together ), i was thinking off adding rails to the inside edge of the X top support. ( i may want to add an impact head to it in the future ). Any opinions ?
2. any idea when the files will be available, am eager to have a crack at this.
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