Page 2 of 2

Re: Pen holders

Posted: Thu Jun 21, 2012 9:34 pm
by dointhangs
has anybody played with this eggbot pen holder? Does it offer us anything here? Its hard to get a feel for the "hinge mechanism" or how easy it would be to mount from the pictures.
http://evilmadscience.com/productsmenu/ ... 204-penarm

Re: Pen holders

Posted: Thu Jun 21, 2012 11:17 pm
by SnapFracturePop
I have an Eggbot - I don't think the pen arm on it would offer any benefit here. It's a very simple solution to providing a Z-axis that doesn't need much accuracy. That's not to say I don't love my Eggbot for what it does, but aside from adapting some of the design elements to a new mount, I don't see it helping too much here.

The hinge is a piece of flexible plastic clamped to both sides of the arm. It can't turn very far and can be twisted a bit if too much force is applied

Re: Pen holders

Posted: Fri Jun 22, 2012 6:47 pm
by Max Metz
There is some ingenuity on display there Burke, you are certainly very adept with your hands. Looking good mate. :D

Re: Pen holders

Posted: Sun Jan 06, 2013 6:13 am
by wickity
Resurrection time...

How does this mount fare with a ballpoint? To me, that's the holy grail of plotting with the ShapeOko... The felt tip has several issues, specifically with "spotting" where the begin/end of the tool paths are for any given shape.

Re: Pen holders

Posted: Sun Jan 06, 2013 1:01 pm
by cvoinescu
Just a word of warning: most ballpoints have "runout" (heh), because the lead can wiggle inside them. The really cheap one-piece pens (e.g. the yellow Bic) are better; but for best results, mount a Parker lead directly, with no pen.

Re: Pen holders

Posted: Mon Jan 07, 2013 4:06 am
by wickity
Good point. I've bought a selection of pens to try out to see which gave me the best result. I have the most hope for the ballpoint easy flow gel types, as I'm hoping a very light pressure will work those, but give a nice consistent line. I may need to dismantle one or two if they get wobbly, and try to mount the writing hardware more directly.

Re: Pen holders

Posted: Mon Jan 07, 2013 3:52 pm
by cvoinescu
I like the Uniball range a lot. For a long time, the Uniball Vision Micro has been my favorite writing pen (until I switched to the Pilot Precise V5 RT, but that's retractable so it suffers from the wiggling lead; a non-retractable version exists too). However, be aware that gel and liquid ink pens, whether ball point or fiber point, work well only in a narrow range of pressures (fairly light), so you probably need a spring-loaded holder of some sort. Traditional ballpoint pens are less demanding, but also less neat.

Re: Pen holders

Posted: Sun Jan 20, 2013 5:33 am
by Jimmy0x52
This was quite literally fashioned entirely in Home Depot. Used the miter box in the trim aisle to cut a couple lengths of this PVC that was 1/2" OD, then a spring from the handyman spring kit and a couple 5/16" ID grommets from the plumbing aisle. Just need to fashion some mounts for the Oko and I'll be all set.
ImageUploadedByTapatalk1358660007.601136.jpg
ImageUploadedByTapatalk1358660007.601136.jpg (175.24 KiB) Viewed 7176 times