1200mmX900mmX170mm 4axis cnc

[Nickhofen]

Workbench plans.
50x50x3mm build, any suggestions?

[AndyUK]

Hi Nick,

I'm still learning, but some of the best bed frame designs I've seen have a bed which attaches to the legs with screws, so you can change the height of the bed, or swap it out for a different one in the future. The other thing I thought was quite sensible would be room at the front and sides for sliding large pieces in underneath to work on their edges - looks like you've hit the nail on head already for that one though!

Hope that helps!

[Nickhofen]

Hi Nick,

I'm still learning, but some of the best bed frame designs I've seen have a bed which attaches to the legs with screws, so you can change the height of the bed, or swap it out for a different one in the future. The other thing I thought was quite sensible would be room at the front and sides for sliding large pieces in underneath to work on their edges - looks like you've hit the nail on head already for that one though!

Hope that helps!

Hi Andy.
Somehow I miss your post earlier.
Thanks for the comments, I read other's guys threads here and I am stealing ideas, I hope this is not inappropriate. :-).
Something I forgot to mention is that at the one end of the bench ,that is at a lower lever is for the rotating axis.

[Nickhofen]

Any thoughts about the design and the dimensions of the steel tube I use?

[Clive S]

Any thoughts about the design and the dimensions of the steel tube I use?

I think 3mm is a bit thin for tapping into

[Nickhofen]

I think 3mm is a bit thin for tapping into

Hi Clive.
Nice input,thanks!
I will then go for 50x50x4, maybe?

Nick.

[Paul3112]

Hi Clive.
Nice input,thanks!
I will then go for 50x50x4, maybe?

Nick.

Hi, May I ask what rails/tracks/guides you are using and what is the method of attachment? What do you want to cut?
The span of the section is where you need to pay attention. Mass/stiffness can be your friend.
Welding can be you enemy with shrinkage and distortion. The 50 x50 x3 might be used for bracing , but the main rail support might be stiffer with 75 X 50 X 5.0 RHS.
Tool load and weight of the material you are cutting will also dictate frame material properties. Sorry not many answers and a lot of questions.

Paul

[Nickhofen]

Hi Paul, thanks for your participation to this thread.
Rails I am planing to use HIWI linear square rails, attached with screws .
I am planning to cut wood mainly and I will be glad if the machine can cut aluminum also,I know that I can not have a cnc that can do both works well, so the main purpose is to build a cnc foe woodworking-guitar building.
Thanks for the input about the main rails, i will use it at my upgrate workbench design.

[Nickhofen]

I have a lot to learn....

[hanermo2]

You will probably dislike my advice ..
Which is unfortunate, since it is excellent and will help You a lot.

All, absolutely all cnc and mills/routers/machines depend on rigidity.
A common error using linear guides is comparing the max strength of a linear guide to actual work, or load.

A typical old manual lathe, 11-12", has 50 metric tons "strength".
But cutting loads are 50-100 kgf.

The reality is that modern machine tools are about 2% loaded at max vs strength.