LR4 Braces : numbers and holes functions?

LowRider CNC Advice
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I’m building a full sheet (48x96 inches) LR 4.

I’m confused with braces about two things :

  1. How many braces, 7 or 8 total ?
    Struts generator default suggests 7 braces and 1 max braces
    3D printed parts list suggest 6 braces and 1 max.
    Which one is the good one ?

  2. There are 3 holes in the brace side (circled red in the picture), are they useful to something ?

I’m asking about the holes because I need to make a special controller box and I need to make it deeper (closer to the front strut back). So the box will blind those holes, not sure they are used anyway…

Anybody can confirm that ?

Thanks

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However many are suggested by the strut generator. The smaller number in the list may be for a smaller size build than yours.

AFAIK, they are there for potential use for custom purposes, but are mostly unused. You could use them for attaching zip ties to hold the cabling in place (cable management). It doesn’t matter if you cover them with a controller box (someone correct me if I’m wrong)

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I haven´t cut my rails yet but I intend to get a 1400 mm beam with 8 total braces, from the calculator a 1403 mm strut.

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They are there to attach the beam to the braces, they are all the same, 1 max brace has more infill plus the one that is different.

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So I’ll align myself with the struts calculator for 8 braces.

And I will enlarge my controller box to my need, even if it will partially obstruct some braces accessories holes. They could still be use for tie wraps…

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Yeah, there are others especially for this. :slight_smile: But yeah, they can be used.

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I can’t see how they attach brace to tubes ?

Holes for tubes are on the brace ends (small width), not on the side ? They are used to pinch the tubes with bolts and nuts… That’s my interpretation.

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Sorry, beam to plates.

This step:

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Since I need 6 drivers for my project (tangential cutting knife), I could not go with the Jackpot controller.

So I have turned to 6x external driver universal CNC controller. The board was bigger.
I also want to put the Airedale expander and the pendant/display module connector.

This leads to this big box. I don’t need the fan there since drivers are external.

Now I need to fit the external drivers another place…

Edit : I could have gone with Jackpot at first, but my initial plan was to use an StepCraft OTK-3 oscillating knife and could not use the Jackpot for compatibility issues… Now I have this board and the external drivers, I will use them.

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The Jackpot does have 6? Or am I stupid now? :smiley:

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Yep.

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Yep you are stupid or yep there are 6? :joy:

/edit: there are 6: Jackpot3 CNC Controller - V1 Engineering Documentation

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No your not and you are right!

But when I started this project, and I give you the short story here, I was going for a oscillating tangential knife (OTK-3) that would have required particular inputs/outputs that I couldn’t fit with the jackpot, so I turned to FluidNC universal controller. I would have taken one with onboard drivers, but it wasn’t available for me in my region, didn’t want to order PCB fabrication and assembly for one board only, so I did go with the external drivers controller that was available.

Well I’m not going for the oscillating knife now, but in anyway, it will be possible with this setup if I do want to go there.

More hassles in the end, probably, but that’s what I have at hands now.

In fact, I just don’t reminber exactly why I could not use the Jackpot, but it was a compatibility issue with the StepCraft OTK-3 oscillating knife I plan to use first… I think it was the stepper voltage requirement of 30V and others required signal for this tool. Couldn’t do it with jackpot…

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