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randysteck

Hold Down Clamp V2

by randysteck Mar 27, 2018
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what size is this? when I put it into cura it is microscopic

The design was done with dimensions in inches . If you load it assuming metric values it will show up as very small. It needs to be loaded as inches or scaled by a factor of 25.4 to get millimeters. Most slicers recognize this problem and help with the scaling as this is a common problem. I'm not sure about Cura.

Looks like a good iteration. What's the max height these can hold down?

I've used them for 3/4" and 1.5" stock on the CNC. You can always increase the holddown height by lengthening the bolt and setting the other end on a riser, so in that respect there's really not much practical limit. The main thing to look out for is staying clear of the moving carriage as these stick up on the outside the stock by some amount (determined by the tightening nut or knob).

Thanks. Might be cool to lengthen short side a bit so you don't need riser, like this reversible one - https://www.thingiverse.com/thing:21057

Reversable Hold-Down for T-Slot Tables

There's nothing preventing them from being used in reverse fashion. I've used them both ways, and actually did the stress analysis for both cases but just didn't post it. If that's not enough, the Fusion files are also posted so go for it.

Curious, what tool/software did you use to run the stress simulation?

I used the simulation function in Fusion 360. It seems to be good for a first order analysis with some moderate complexity. I wouldn't use it for advanced rocket sims, but for these sorts of things it can give pretty good, and often surprising, insight.