What's Paul up to?

[jcdammeyer]

Calibration first layer patch. I'm now running with the 1.750 mm extruder offset.
View attachment 42900

Shouldn't look like that. Where did you get the calibration part. I'll try a first layer here.

 

[PaulL]

Shouldn't look like that. Where did you get the calibration part. I'll try a first layer here.

Printables

www.printables.com

Adjusted part way through to go from the crappy looking bottom left to the better looking top right.

 

[jcdammeyer]

Printables

www.printables.com

Adjusted part way through to go from the crappy looking bottom left to the better looking top right.

Heading out. Will try that on mine when I get back.

 

[PaulL]

Heading out. Will try that on mine when I get back.

Benchy McBoatface worked, now that I glued it down.

 

[PaulL]

First useful part!

It takes up the slop between the nominal 1.5" lathe bore and the nominal 1.5" draw tube. It's gently tapered to make insertion easy.

Certainly easier than turning this bushing.
I should add - this was worth about 2 10th on the collet runout. Still waiting for the thrust bearing that will let me tighten down a bit better.

 

[PaulL]

Ok, this is nutty easy at this point. Probably needs a post in "waited too long".

Handwheel for my drawtube. Just printing the hub now with 5% infill for a full sizing test, then tomorrow I should have a handwheel.
I can see how awesome this would be to couple with some aluminium casting technology.

 

[Dan Dubeau]

I can see how awesome this would be to couple with some aluminium casting technology.

It's pretty awesome. I have a couple new projects working their way up the list that will be sand cast from 3dprinted patterns I will post about when I get there. But here are a few of my older ones
https://bbs.homeshopmachinist.net/forum/general/1993667-todays-casting-adventure

 

[PaulL]

Handwheel for my drawtube.

Test fit is tight enough to turn the draw tube without any sort of pin holding it. It won't last, but it's nice.

 

[jcdammeyer]

So here's my two shots at it. The glass bed printer height is set with 4 knobs on 4 corners and a feeler gauge. Since the printer is sitting on a wooden top that can expand and contract with temperature I find I periodically have to tweak it. The SOVOL I put onto a 1.25" granite sink cutout slab. So although the folding table shifts a bit back and forth the granite keeps the SOVOL at one spot and it has a touch sensor and can map the entire 300x300 build area.
It looks like the Glass Bed could be tweaked a fraction of a hair closer so the filament runs together a bit more (NIKON camera). The SOVOL (Cell Phone Camera) is better for height. I should probably map it again. Haven't done a full bed mapping for a while.

 

[PaulL]

So here's my two shots at it

My reading of those is that I want to let up a tiny bit on mine to avoid the over squish of adjacent lines?

 

[jcdammeyer]

For the first layer you do want the squish of adjacent lines but you don't want so much that it oozes out and up creating bumpy layers.

If you look at the SOVOL choices you see initial layer height and line width. With the 0.4mm nozzle it feeds enough filament out at a given travel speed to create the 0.4mm width and the height above the last layer or bed is 0.2mm. Each pass is 0.4mm over so the lines theoretically touch and bond before cooling.

The extra parameter for Initial Line Width as a percentage would make the 0.4mm width actually 0.6mm wide and 0.2mm high squished against the surface of the nozzle.

I'm finding the SOVOL (or CURA slicer) doesn't seem to pay attention to that 150% value I have there. It could be I'd have to slow down the printer. Perhaps it can't feed 50% extra material at the printing speed. It's on my investigate the issue list.




The reason you need the first layer touching tightly is to create maximum surface area on the build plate for adhesion. There is something called a BRIM which you can enable. That adds extra surface area around the perimeter base attached to the base and keeps the corners from lifting for from it coming loose.

A small tall part might only be 2mmx2mm and expand outwards. Adding a large BRIM that sticks to the plate and to the adjacent strands will hold the tall skinny part down on the plate. But if the BRIM tracks don't touch or even touch the main part then they are just a series of loops that do nothing.

 

[PaulL]

Thrust bearing came for my draw tube. Easy firm fit on the shaft, inserted between the collar and the plastic bush. It's not a high speed rotation it's absorbing, so I don't mind not having nice ground surfaces for it to ride in. Made a real difference on the amount of effort needed to tighten the collet down. That translated to another couple of tenths. I'm now down to just under 5 10th runout with my cheap import collets - I'm calling that success.
I also made up a little tool for holding the spindle still while tightening. Of course I made the pins in the new collet setup - it was a joy compared to messing around with the 3-jaw.

 

[PaulL]

So I worked some on my gridfinity-compatible OpenSCAD bin maker, largely driven by the lack of text support in the other solution:

The text is adaptive in size depending on its length, and can be either on the whole bin or on the sub-bin. I used the poor-man's multi-material method, squeezing some modeling clay into the lettering reliefs. This is now complete enough to satisfy most of my needs, though clearly that won't last.
If anyone wants to follow along, the git repo is hosted at https://github.com/paul-lalonde/gridfinity-flux, and I'm open to requests as long as my attention is pointed in its direction.

 

[PaulL]

My mastercrap tap holder exploded! The jaws seem to have sheared right along the hole that the sprin pin slots into:

Not the end of the world as I have a few other tap holders, but still vexing.

 

[DPittman]

My mastercrap tap holder exploded! The jaws seem to have sheared right along the hole that the sprin pin slots into:
View attachment 43194
Not the end of the world as I have a few other tap holders, but still vexing.

Yes I've had that happen also, no doubt quality of materials was the biggest factor in my failure but I've also found that tightening the jaws down very well on tap helps limit the failures

 

[whydontu]

My mastercrap tap holder exploded! The jaws seem to have sheared right along the hole that the sprin pin slots into:
View attachment 43194
Not the end of the world as I have a few other tap holders, but still vexing.

Hard to believe that the jaws of the tap holder are more brittle than a tap.

 

[DPittman]

Hard to believe that the jaws of the tap holder are more brittle than a tap.

I believe one of my tap holder jaws is cast iron, (or cast iron like)

 

[PaulL]

The real question - how many times do I need to make saw arbors before I start getting it right? This is my 4th, I think?
Previous one was way excentric, probably because I put the seat for the blade on the screw-part instead of the body. Wasn't thinking.
This one seems to run much more true. Also, monstrous 1" wrench flats on both parts. Not skimping there again.

 

[Tom O]

I bought one of those one size fits all from Busy Bee I never could get it apart after the first use. From what I have seen they all pretty well run a bit eccentric but no worries there’s another tooth coming up. ( They use a Allen key to tighten theirs )

 

[PaulL]

I bought one of those one size fits all from Busy Bee I never could get it apart after the first use. From what I have seen they all pretty well run a bit eccentric but no worries there’s another tooth coming up. ( They use a Allen key to tighten theirs )

Yeah, that's basically my analysis after looking at them for a bit. Knowing how I killed my first 3, there's no way the one-size would have survived.
It's also not a particularly big deal to make one up, once the principles are understood and the stock is on hand.