Search found 18 matches

by EricPeterson
Thu Jan 25, 2018 4:52 pm
Forum: Printed Object Showcase
Topic: Hardwareless Toy Caterpillar Tread System
Replies: 4
Views: 1970

Re: Hardwareless Toy Caterpillar Tread System

OK, the 20 tooth drive cog link gets you both right and left versions now. Again, the only difference is which side has the build platform added, so that you get a nice surface finish on the side with the grooves you need for the track on that side of the vehicle.
by EricPeterson
Thu Jan 25, 2018 4:32 pm
Forum: Printed Object Showcase
Topic: Hardwareless Toy Caterpillar Tread System
Replies: 4
Views: 1970

Re: Hardwareless Toy Caterpillar Tread System

Thank you sir! Here's the 20 tooth drive cog with the revised clearances -- only one side for now. Remember these are right- or left-handed cosmetically because the track is asymmetric on the back: http://www.scifiwheels.com/images/M2Parts/cog20t.zip Here's a short fuzzy ancient cell phone video -- ...
by EricPeterson
Wed Jan 24, 2018 5:53 pm
Forum: Printed Object Showcase
Topic: Hardwareless Toy Caterpillar Tread System
Replies: 4
Views: 1970

Re: Hardwareless Toy Caterpillar Tread System

Note: I'm getting better performance out of the test set when I decrease the width of the cog teeth by .020" and increase the widths of the two adjacent grooves by .010" each to compensate. I've got a 20-tooth cog now with those dimensions and I can get really high speed out of the setup -- the trea...
by EricPeterson
Tue Jan 23, 2018 5:06 pm
Forum: Printed Object Showcase
Topic: Hardwareless Toy Caterpillar Tread System
Replies: 4
Views: 1970

Hardwareless Toy Caterpillar Tread System

It occurred to me one morning it might be fun to design a hardwareless caterpillar tread assembly -- links that would simply snap together with a proper over-rotation and slide into place. No deformation... no bending... just fold them back into a relative angle they'll never see installed, and <cli...
by EricPeterson
Mon Sep 18, 2017 3:42 pm
Forum: Tech Support
Topic: M2 Build Plates Slowly Deforming
Replies: 11
Views: 3060

Re: M2 Build Plates Slowly Deforming

Ah, old post, new information. My original post concerned apparent deformation in the long axis of the build plate. I was advised that it was more likely deformation in the frame and linear way. There WAS deformation in the long axis' linear way. I fixed that by adding a miniature I-beam below the v...
by EricPeterson
Tue Aug 16, 2016 7:41 pm
Forum: Modifications
Topic: Stiffening The Long Horizontal Gantry
Replies: 7
Views: 1681

Re: Stiffening The Long Horizontal Gantry

thats great but that is the y gantry and not what ed and i were talking about in the other thread. x gantry is the one that is prone to flexing or bowing down in the center from belt tension. never seen anyone have that problem with the y. generally you just need to slightly shim that top rail to t...
by EricPeterson
Thu Jul 28, 2016 8:49 pm
Forum: Tech Support
Topic: M2 Build Plates Slowly Deforming
Replies: 11
Views: 3060

Re: M2 Build Plates Slowly Deforming

Here is the post describing my fix.

viewtopic.php?f=10&t=3957
by EricPeterson
Thu Jul 28, 2016 8:48 pm
Forum: Modifications
Topic: Stiffening The Long Horizontal Gantry
Replies: 7
Views: 1681

Stiffening The Long Horizontal Gantry

I had problems with the long gantry deforming due to high belt tensions. I ran higher than standard belt tensions to handle large pieces without dropping accelerations too far. I was advised to shim the linear way's rail. That's not the right way to go. The right way to go is to stiffen the beam ben...
by EricPeterson
Thu Jul 28, 2016 8:41 pm
Forum: Tech Support
Topic: M2 Build Plates Slowly Deforming
Replies: 11
Views: 3060

Re: M2 Build Plates Slowly Deforming

Of course. I was being imprecise. I've lowered the speeds per various recommendations and the accelerations months ago.
by EricPeterson
Mon Jun 27, 2016 8:17 pm
Forum: Printed Object Showcase
Topic: Making a Replacement Cooling Impeller
Replies: 8
Views: 3473

Re: Making a Replacement Cooling Impeller

I hadn't seen that this discussion went on after the first few responses. And thanks for the kind words, folks! Bratag, yes, I improved the design considerably. The original straight-bladed soft plastic impeller was really only appropriate for radial discharge, whereas the fan housing only allowed f...