Tubing straightness advice

LowRider CNC Advice
1

hi,

Working on my first CNC/Lowrider machine.

In Europe we do not have the standard conduit tubing like in the BOM. So I ordered 30mm stainless steel tubing. Apparently steel tubing has a straightness tolerance of ±0.002 L (L=lenght).

In a half sheet configuration LowRider that adds up to ± 3mm or 1/8” on either X or Y. The tubing that I ordered has a slight bow in it.

I am wondering what the experiences are of others? how do you deal with this?

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2

The stainless steel are nothing but trouble (I built a Primo and a LR3 with it). It’s also not precisely round.
In the EU I’d advise everyone to buy Präzisionsstahlrohr (it’s basically DOM) in 32mm from jabimetal.at now.

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3

Thanks for your quick response. Two follow up questions:

  1. Do you apply any rust prevention? (E.g. machine wax)
  2. Any specific reason you use 32mm? Just printed everything for 30mm, would hate to throw it away.
4

Bigger pipe, bigger diameter, more stiffness. :smiley: I have 3mm walls as well (though those are not really needed).
I did clean them and rubbed them down with Silbergleit. That works pretty well. There is minor rust I can just wipe away with Silbergleit and paper towels.