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ABS Sun Gears for Emmetts Automatic Tranmission Model

by zaaphod, published

ABS Sun Gears for Emmetts Automatic Tranmission Model by zaaphod Dec 13, 2012

Description

I had very bad curling problems while trying to print the sun gears in ABS... the overhanging cone in the center kept curling up and then the extruder would hit it. I realized it only curled away from the brake tab, because the brake tab was holding it from curling. So as a solution, I added 2 more brake tabs, I also widened the small part of the cone just a little bit to reduce the overhang distance. I also had problems with the gear teeth curling up from the platform, so I printed them with a brim in slic3r and that solved the problem, trimming the brim off was not too hard, as I made it wide enough (6mm) so I could just grab it and pull it away from the gear. This is posted as a work in progress because I am still printing the rest of the parts to assemble this and I'm not completely sure there will be clearance for 3 brake tabs, although it appears to be fine in openscad.

Update: I have my transmission model finished and assembled and these gears are working great with it!

Recent Comments

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I was having similar issues with Glow in the dark PLA.. I have to print it quite hot to get it to extrude cleanly for solid infils and the like.

I tried pushing my bed temp up with little success, I'll print this version and see how I go.

I have a lot of ABS, and I don't have temperature control for my heated bed yet, and it's too hot for PLA, so I thought I would just see what I can do with ABS.  I also want to eventually make some gears and timing pulleys to put on fairly large stepper motors and I think they will be running too hot for PLA, so this is good practice to see how to print gears with ABS.   As you can see I have a lot of colors of ABS to play with too.  I must admit the curling with ABS can be very annoying

Good thinking.  Too bad ABS isn't easier to work with.  I've pretty much given up on it in favor of PLA.  Nice that such simple addition can make such a difference.

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Instructions

Print these Sun Gears with 3 Tabs when using ABS. These were printed with a single extruder head pausing and changing colors after layer 5.

Comments

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atreidae on Mar 21, 2014 said:

I was having similar issues with Glow in the dark PLA.. I have to print it quite hot to get it to extrude cleanly for solid infils and the like.

I tried pushing my bed temp up with little success, I'll print this version and see how I go.

adamsbriand on Dec 13, 2012 said:

Good thinking.  Too bad ABS isn't easier to work with.  I've pretty much given up on it in favor of PLA.  Nice that such simple addition can make such a difference.

zaaphod on Dec 13, 2012 said:

I have a lot of ABS, and I don't have temperature control for my heated bed yet, and it's too hot for PLA, so I thought I would just see what I can do with ABS.  I also want to eventually make some gears and timing pulleys to put on fairly large stepper motors and I think they will be running too hot for PLA, so this is good practice to see how to print gears with ABS.   As you can see I have a lot of colors of ABS to play with too.  I must admit the curling with ABS can be very annoying

zheng3 on Dec 13, 2012 said:

Nice print!

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