Quote Originally Posted by Robert Millard View Post
Hi everyone
here's my 8x4 mdf CNC with vacuum table build
its a little agricultural but hopefully I'm getting there!!
I have some Vee bearings on order so once the vacuum table is finished I'll be on that next
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Hi Robert, firstly welcome to the forum , you might not believe it but there are some supremely helpful guys on here (the ones who have answered you are some of them!!) who will gladly help you out with any questions you have.

Where things have gone a bit pear shaped from the start here is that you didn't state that it was for a one off job so had to be done on the cheap using what scrap wood you had etc. etc.

feel free to comment and any heads up before I make any costly mistakes are more than welcome
Generally wood (and MDF specifically) is not a good medium for a CNC machine that looks as though it's needed for production (which is all we have to go on looking at your pictures of your workshop) and when you couple it to Vee bearings everyone on here immediately ducks for cover . Yes wood machines can be made to perform OK but at this size and for cutting wood you need speed and to get speed from ball screws you need large diameter ones with a large pitch and these need Nema 34 motors at a minimum with 230V AC drivers which starts to get expensive....even from China.

If it is truly for a one off job then have you considered belts and pulleys? You could use smaller Nema 23 motors and smaller drivers then and the cost will be minimal.

If it's not for a one off and you're thinking of using the mechanical and electrical components for CNC Router V2 then (normally designed when you're 1/2 way through the first build) what the lads are saying (and will continue to say) is do it once properly rather than as a compromise this time and then properly next, that's all