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

[Lee Roberts]

Typically you would spot drill the hole first with a spotting drill bit (like a normal bit but shorter and so stiffer) or a center drill bit, a smaller diameter drill bit maybe used as/or well, just take your time as they snap easily at those sizes.

I can't see this would be a problem with your bench drill though, would continue to use it instead of going free hand personally.

.Me

Edit: Not sure if you've settled on a Z Axis design yet but here is a link to how I've done mine using 20mm plate and TBR16 round rails:

Link: http://www.mycncuk.com/album.php?albumid=387

[grain_r]

Hey Everyone

I have been working Away at the base still and we have a new baby Daughter arrived too. So not too much work been done.

But the internet is a cruel master I have been looking at all of the threads and it seems like Hiwin is the way to go and sell the Supported SBR20 Rails ?

I have been looking at the 20mm and 25mm but I'm unsure if the bigger is better rule applies on this. I am just thinking that once all of the holes are in the nice new steel and the aluminium it will be best to swap now especially how long it takes me to do anything.

I think my design will still be good for the rails instead of any changes I have had a look at chai's site on Ali Express but seems more expensive than others but is Hiwin the same from everyone and they are just suppliers or are there differences in the quality of these things.

Thanks everyone.

Rob

[Colin Barron]

Were there no cheap scrap accurate machines that could have been rebuilt.

[grain_r]

Were there no cheap scrap accurate machines that could have been rebuilt.

Hello Colin I think that if something comes from your head and you build it you achieve knowledge if nothing else.

I have bought unfinished projects for other things before in life and they are rarely a simpler and cost effective way of doing things and normally a compromise in design and quality.

That said I imagine there are some very good machines out there that have started life as another machine.

The build is taking quite a while to get the frame finished but I'm certainly enjoying every second of the process.

Thanks

Rob