RepRap: Blog

Right, wasn't as bad as I'd feared - and my rebuilt laptop seems to be holding up.

Now both pairs of the XY Table Flexure Assembly complementary flexures are of equal length. I basically stuck a booster on the outside flexures to make the internal and external complementary flexures the same length. The X pair and the Y pair aren't quite the same, but that doesn't affect positioning. I've used less clearance on the mechanism (lengthened it) to offset some of the loss of flexibility from shorter flexures.

The  V0.04 will put the Table about 1mm higher than V0.03, which is well within the range of adjustment of the V0.03 Axis Drivers and framework. 

The non-linearity of V0.03 added up to a total of 40μm (according to my cheap digital callipers) over the entire range of motion, which is just over 8mm. So within the central +/-2mm of work area that amounts to a vertical error of less than 10μm, or about one thickness of the resin layers I've been depositing.

I'd noticed some offset but had put it down to experimental error or non-linearity of the drivers. Etching requires fairly enthusiastic lowering of the probe, and I've not deposited anything very large in resin, so the problem wasn't terribly obvious.

Anyway, got a few personal things to sort out, then I'll queue up a print and put a new XY Table Flexure Assembly together. If there are no unforeseen part collisions I'll tag the old V0.03 release and update Github. [Edit: Spoiler Alert, there were.]

Time for a backup... 

# posted by vik-olliver @ 3:38 AM