Thread: Fixed z axis to gantry design
Everything refers to the gantry, that is why it is such a rigid design. The overhangs are minimalized.
Okay, you need something to support it so it doesn't fall over, but a strut? Does that not detract from the beautiful simplicity of the design? That tower in Pisa would get a lot more benefit from a strut than this, but it doesn't mean you should fit one. I mean, how gauche
The Gantry rectangle is only has strong has it's connection to the base hence the massive plates. It would greatly benifit from more bracing higher up with connection to the lower frame. Yes Maybe not looking has simplistic but what we building here.? machines to do a job good or poser machines.!!
I didn't see that movie. It doesn't need a strut, it needs the rails fixing to the bottom of the bed and the blocks fitting to the gantry. Dump the overhangs, kill the vibrations. Simples
I agree the Bearings on the base and rails on the bed would be a better option but it's not the weak link in the machine. The High gantry frame without support is far more a weak link and source of vibration IMO.
Hi Robin, Lachlan,
Maybe this helps explain it. If you remember the days of 'free-body-diagrams' - the bed is part of the system. See picture which shows all the forces acting.
You can hopefully see how the extra brace can help. This is where myself and Jazz are coming from.
I think Wal created something like this (although smaller) and grappled with different layouts to make sure the 'tower' was stiff enough.
Can it work without the brace - of course. Is it much better with it ? - yes, significantly, and for little effort.
Why does this chap spend a long time adjusting the rails to be perfectly parallel and then use a lump of pine as the base for cutting? Seems a shame, since pine obviously isn't flat and stable!
Was surprised and happy to see so many responses. Thankyou! I think the triangular bracing of the gantry is a must for this build it makes sense as a gantry triangulated is so much stronger than a gantry just flapping in the breeze so to speak. I have some 50x50x4 box steel surplus, would that steel cut the mustard for this frame build?
The nut should be under the gantry and the screw moving with the bed.
That puts the linear bearings permanently underneath the cutting head.
Looks a bit odd, but if you draw it you will see enormous benefits.
Not being funny or picky here but please stop calling it the gantry it's the base Frame and I'm easily confuddllledd. .
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