Now given the Short length and to be honest even the Gantry isn't massive wide then suggest you use Ballscrews and save lot of hassle. You'll get much better accuracy and far better reliabilty. Won't cost much more money either.
Personally I'd drop the profile that sits on the bearings and increase the height using taller profile or 2 pieces. Then sit the Gantry profile directly on the bearings fasten to a plate.
I'd also have stiffer gantry. 2 pieces arranged in L config is very stiff. Like this
Thanks for the feedback on the new design.
I was thinking to fasten the bearings to the gantry profile using bolts and t nuts that slot into the profile groves.
The x axis will be around 100cm and the gantry (y axis) will be around 150cm. Is this considered small?
No z axis because i wanted to address what i had so fare.
I'm using 80x120 on my x axis. To increase the height, the only larger profile is 80x160 in that range. This would add 40mm. Should i go with two 80x80, one 80x160 or somewhere between?
The L shaped gantry in your photo looks to be using two lengths of 80x120 making the gantry 200mm high. Is this right?
My original plan was to make a router that could be upgraded in size (4'x8') when the time came. That's why i was going for R&P and not ball screws. Is this a practical approach considering that the alternative would mean starting from scratch?
Ill make some alterations and post them soon. :-)
Personaly I'd build with the intent of building another machine when want larger. You'll then be able to put all you've learnt and design changes into the new improved larger machine. Use the First to build second then Sell it complete and working. If do this right you'll make money rather than costing money converting.
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