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Paper/Kapton Automated Build Platform Conveyor Belt Replacement
Written by MakerBlock   
Monday, 14 February 2011 00:00

Authors: MakerBlock


Paper/Kapton ABP Conveyor Belt by AVataRR

Paper/Kapton ABP Conveyor Belt by AVataRR

New Thing-O-Matic owners will be pleased to know that your robot kits will be shipped with pre-formed pre-assembled conveyor belts.  For everyone else, the MakerBot store has these in stock.  I’ve got one installed in my Thing-O-Matic and it doesn’t snag or pull apart as my self-assembled one sometimes did.  Assembling the automated build platform conveyor belt from the die cut PET parallelogram and Kapton tape can be challenging, especially without a friend to help.

Thingiverse Citizen AVataRR just uploaded his method for creating a paper/Kapton ABP conveyor belt using regular A4 paper, a tracing of the die cut plastic belt, and Kapton tape.  For those of you without a die cut plastic belt on hand, you could always use Mraiser’s scan of the belt.  When asked in the comments about the risk of fire, he explained:

I think as long as the paper is kept away from naked flames or sparks, it should be right. The auto ignition temperature of paper is ~450 degrees C. The ABP only goes up to 110 degrees C and the plastruder hovers between ~220 to ~230 degrees C during printing.

Clearly, someone has read his Ray Bradbury.  Awesome work AVataRR!

Read more: http://blog.makerbot.com/2011/01/19/paperkapton-automated-build-platform-conveyor-belt-replacement/

Last Updated on Monday, 14 February 2011 01:08
 
Amateur CNC mill show and tell
Written by admin   
Wednesday, 09 February 2011 00:00

Authors: admin


Howard Matthews build this CNC mill using parts he already had on hand. He took the stepper motor out of a nightclub light machine, precision rod and bearings from old dot matrix printers an other parts from his junk box. Check construction details on the link below. 

Amateur CNC mill show and tell –[via]

Last Updated on Wednesday, 09 February 2011 02:36
 
Make your own plastic mini lens
Written by admin   
Saturday, 22 January 2011 00:00

Authors: admin

This article shows how to make your own plastic mini lens to be used on image sensors. This lens is build for image sensors that are a millimeter wide. This post highlights a little project to design a decent lens for the Faraya64 image sensor, whose focal plane measures about 1.1mm across.

Make your own plastic mini lens –[via]

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Last Updated on Saturday, 22 January 2011 00:22
 
Things I learned cleaning my Plastruder MK5
Written by MakerBlock   
Monday, 17 January 2011 07:00

Authors: MakerBlock


Plastruder base top plate - with ooze!

Plastruder base top plate - with ooze!

Yesterday I tried to print in pink plastic (a bath hook for my daughter) only to discover I was unable to back the black ABS out of my MK5 plastruder.  I could extrude, but I just couldn’t back it out with the motor or pull it out after loosening the Delrin plug.

By way of background, and in the interests of experimentation, I had recently tried a few things with my Thing-O-Matic that are kinda contra-indicated by the assembly and usage instructions.  In no particular order, and at different times I had:

  • Kept the plastruder warmed up and let it sit for a while
  • Let a filament run all the way into the plastruder and shoved another filament in after it

After trying the above and a few different filaments recently, I noticed a  whitish smear along the inside of my plastruder.  The smear was between the toothed pulley and where the filament entered the heater barrel.  I didn’t think anything of it since I had still been able to extrude and print.

Obviously, being unable to remove filament from my plastruder is not really an option.  In order to fix this problem I disassembled my plastruder.  I quickly discovered that the white smear wasn’t just along the path of the filament.  Apparently I had managed to ooze some plastic up out of the heater barrel, around the top of the heater barrel, around the circular hole in the acrylic base to the plastruder, and around the entrance to the heater barrel all along the inside of the plastruder.  This had the effect of “gluing” the acrylic plates of the plastruder together.  Fortunately, there wasn’t a lot of plastic and it came apart rather easily.

The only explanation I have for this is that I must have kept my plastruder hot for too long without running the extruder motor.  This would allow the heat from the extruder to travel up the barrel and essentially liquify the plastic.  Then, once I started up the extruder motor, it must have squished the plastic out of the heater barrel and up into the plastruder.  I also suspect that jamming one filament in after another exacerbated this problem by squishing the filament entering the the barrel with the new filament. 1

With the plastruder disassembled I found white smear could be scraped off.  It had a gooey residue-like consistency – like old toothpaste.  It was easy enough to scrape it off with a putty knife.  Since I already had the plastruder disassembled, I flossed the extruder toothed pulley.  I also was able to remove the filament with everything apart.  I discovered that the black ABS filament was also covered with the white plastic residue.  The extra width created by the residue on the filament probably contributed to my inability remove the filament in the first place.  I also noticed a few notches ground into the filament from when I was trying to back it out.

Once done, I reassembled the plastruder, reinstalled it, fired up the Thing-O-Matic, heated the plastruder, and did a test extrusion.  All in working order!

Read more: http://blog.makerbot.com/2011/01/17/things-i-learned-cleaning-my-plastruder-mk5/

Last Updated on Wednesday, 27 July 2011 14:04
 
Cellphone controlled Robot
Written by admin   
Tuesday, 28 December 2010 00:00

Authors: admin

This project uses a cellphone interfaced via an MT8870 DTMF decoder and an Atmega16 to operate servos controlling a robotic car. Check circuit and construction details on the link below. [via]

Last Updated on Tuesday, 28 December 2010 22:36
 
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