Thread: Cnc2012

Originally Posted by SawDustSniffer

looks good
now the table and z axis will vibrate together it should cut ok with aluminium

what size motors will you be running , with some decent steppers there might be some yaxis flex in the x axis direction , if you can make the foot print wider on the xaxis rail it will run aluminium 10x better

Thanks, Have changed the design. Not sure of the steppers yet, they should be something decent.
Thanks Ben

Going to cut the aluminium soon, any other ideas for the machine?

dont start cutting just yet

you cable chains will be a bastard to mount , how about extending the ends of the x axis , out past the yaxis support , so you can span an angle to carry your cable chain , same with the y axis bring the support side out past the Z axis "carriage " so you can easily mount an angle spanning the distance ( whats your x axis travel now ?)

you have to remember that if you want to cut 50mm deep , the mill end has to hang out the spindle at least 50mm, so make sure your spindle can rise up high enough , ive found 100mm a bit too much , as you wont get bits over 100mm long to fit the small spindles , but the height is good for sacrificial sheets and clamping , but the lower the y axis beam the more accurate it will be //// tough decision

soon after you notice y axis racking you will want to put 2 ball screws under it , it might pay to accurately drill those holes now , if your cutting aluminium i would recommend a dual ball screw x axis , but a single will work

also have a look at some of designs that have been built on this site , it might pay to get the x axis rails out of the dust and grit, hard up under the y axis

Thanks SDS Will have a think about those things.

Had a quote from Chai form Linearmotionbearings, it will cost $364 USD to kit this machine out, which I think is not so bad as with the exchange rate.

have a look at this build
https://www.woodworkforums.com/f170/6b4-143000/
then have a look at other machines Rodm has made

Okay thanks, have now put on places for the drag chain also some dust protection, used the idea that was in Tubot.

Changed the design again, now the frame and rails are connected as one with 50 x 50 RHS, let us know what you think.

Thanks Ben