Yeah that seems reasonable.
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Yeah that seems reasonable.
I see a few things I would change but rather than put into words it's easier to show you. Most Should be obvious but ask if not sure.
The reason for top rail being longer at each is to recover some wasted bed space plus makes machine shorter. Also allows gantry to ride past the end so can use end of machine for standing boards upright or fitting 4th axis across end if required. Long overhang would be rear short would be front.
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Dean,
Thank you very much for your help I really appreciated.
Smart way to increase the cutting area and add future use(4th axis)
Few questions and I think I am good to go.
Steel tubing for the whole base 60 x 60 x 5 ? Do you agree on that?
Length of the bed 2600 + 100 short overhang + 300 long overhang = 3000 total would that be o.k? Do the overhangs need to be braced?
What are the spacing of the cross members and the top rail supports in your drawings? No dimensions so I can't calculate.
Has anyone joined hiwin rails lengthwise let's say 1500 + 1500 to achieve 3000mm length. Is it doable for the home builder? ordering from BST automation 3000mm rails will make shipping cost way up.
Hopefully I will be start building in the beginning of January.
Well kind of but only has a minimum. I'd be more inclined to go with 80x80x5 on such large machine but 60x60 will work fine.Quote:
Originally Posted by arg123
Dimensions will depend on your needs and gantry etc. I only drew this frame to show you and save explaining via text.Quote:
Originally Posted by arg123
That said the dimensions I used where based on previous machines I've designed and are very close to those you mention.
From memory the short overhang was 150mm and the large overhang is the same length has the gantry width. Bracing on large overhang depends on gantry width but if more than 300mm then yes brace it.
Here's a 4x4 machine built using similair frame design but with adjustable height bed. Frame is 60x60x5 box.
Yes it's commonly done on really long machines but does need careful fitting. Thou If possible I'd avoid doing it.Quote:
Originally Posted by arg123
Attachment 16890
Just a note, if joining rails the lengths have to be a different size, Hiwin Installation Manual says you should not have joints directly opposite each other,( I might have to join rails as i have already purchased some but need longer length)Quote:
Originally Posted by JAZZCNC
Regards
Mike
Following Dean's drawings I finalized the base design, so any comments and corrections before I start cutting would be appreciated.
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Blue steel (top rails) is 80 x 80 x 5.
Red steel is 60 x 60 x 5.
Green steel is 60 x 60 x 3. (trying to save on weight).
Top rails would be bolted to the supports for alignment purposes and use epoxy putty(later I would need some more details on that) and then epoxy leveling. Final length of the top rails (overhang) to be decided along the process.
What height from ground to top rails is recommended?
I ordered a straight edge 2000mm DIN 874/2 from same place Boyan did, thank you Boyan for posting the link,
and I also have a precision level 0.02mm/m so I hope I will have a quite true reference plane to start.
Thank you
Now don't go blaming me I had nothing to do with it. . .:hysterical:Quote:
Originally Posted by arg123
No fixed height really but the machine I showed is 950mm. Work out the height you want the bed and how much clearence you need and you'll get to the figure you need.Quote:
Originally Posted by arg123
The height of the bed will come down to ergonomics. The higher it is the more difficult it will be to load heavy material onto. As the same time, too low will make changing the cutters a bit difficult.
My preference would be to make the bed around desk height. The Americans say a typical desk height is 29" so 1metre would be just about right.