a Steel Box Section Build with SBR20 & Ballscrews Plus a few questions

[grain_r]

Hey Jazz
Thanks for the design, so if the parts missing at the bottom it doesn't get any-more twist of the table when in use ? or is the sheeting around it structural and stops this. I love the slider system I have been thinking that it would be not the easiest to lift the bed and get the bolts in, I imagine its just watch your fingers time as you take the last bolt out. your design is very much more evolved most certainly. and I love that there is space still underneath, Would you mind if I use your example I feel bad not making the design myself although I will change it to suit.

I'm sorry to ask so many questions but on the bracing does this have to be specific dimensions e.g. a true triangle for the strength like 45 degrees or just has to look correct. i'm not sure how easy it would be to make it belt driven the only think I can think of is to put the motor on the bottom of the bed and then use a pretty long belt in a 'v' shaping. I see the gantry uses ali extrusion I imagine I would still be better to use the box section for my design.

Thanks very much for the help.

Thanks

Rob

[grain_r]

Hello Again everyone
I have been designing again and hopefully getting somewhere now thanks to the guidance from you guys. I'm not sure whether to go above the top rail and build up or if it is better to build downwards towards the table my thinking it that the strength of the side will help a little if it is below ? although I will have to shim with something to get a gap from the main frame. or would the gains (If any) really be worth it and just build on top?

[irving2008]

Zip the file up, or add .Zip as an extension...

[grain_r]

Hello Neil

Thanks for the PM although thought it might be easiest to try what irving2008, Many thanks for that irving2008 much appreciated.

HGTM_CNC_V2.zip

I'm sorry if the dawing isn't upto much I'm going through a learning curve on sketch up too this is the first time I've used that I try to keep the layers seperate but I forget to change to the correct layer sometimes.


Many thanks for the help

Thanks

Rob

[njhussey]

Hmmm....I've only got version 8 and can't open it.....flipping typical!!

[EddyCurrent]

I was too slow, beaten to it haha

[grain_r]

thanks very much for doing it all the same.

[grain_r]

Hey Neil No Worries, I've just saved it as a version 8 & 6 Just in case and that will hopefully work.

HGTM_CNC.zip


Thanks

Rob

[njhussey]

Get yourself a centre punch set. Select the exact punch size for the clearance hole and punch through to mark for the 4.2mm drill. Use a clamp in one side whilst punching the other so it doesn't move....simples. Punch set is about £13 + delivery I think.

[grain_r]

Hey gents

Brilliant thank you very much for the tips. Unfortunately I don't have access to a lathe although the occasional eBay search has been done . I thought I might be able to achieve a similar creation by glueing some washers together in a stack on a plate to keep it all true. I have seen that people also put taps into the drill press and do it this way that I thought may be worth a try.