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Re: 25% done - 16 years ago

Samuel I believe you are correct about the double motors fixing inertia. That was their special thing was that their gantry CNC would accelerate and decelerate all over the place and the huge head definitley had inertia. 2 inch diameter end mill on a tilting head flying around was pretty entertaining to watch! I do believe the double motors also fixed backlash but inertia was the main reason..

by mikefazz - Reprappers

Re: 25% done - 16 years ago

To understand backlash get a couple of gears meshed. Hold one still and rotate the other clockwise and counterclockwise.... that is backlash. So basically any time you switch directions you have a little 'slop' to deal with. I believe with the right machinery (high precision) you can reduce this significantly. I toured janicki with school a few years back. They have massive gantry CNC's and

by mikefazz - Reprappers

Re: 25% done - 16 years ago

Thanks Demented, Well I'm glad I posted before going and ordering more parts. I'll have to think about the pulley and chain setup I guess all paper printers go that route so it can't be that bad. Though I may need a significant re-design. One great aspect of 80/20! Tear down and rebuild in less than an hour For the enclosure I hope to have the rack on drawer sliders so I can pull it out and

by mikefazz - Reprappers

Re: 25% done - 16 years ago

Ah thanks for all the input Corwin: Yeah I looked around online and the bearings apparently are problematic. I already had most of the 80/20 I need so wanted to give it a go. I hope to keep the stage light so the loads on the bearings stay fairly balanced. The sizing is actually 1530 (1.5" x 3") so that may help a bit too... I plan to use threaded rod down the inside of the 1530 with a slot

by mikefazz - Reprappers

25% done - 16 years ago

So I have begun some real work on my RepStrap. In the picture you can see the mess of progress. I have the following: - Most of the main frame in 80/20, I will see if I can get those bearings to work (cross my fingers). It follows the knee mill setup. - I have all the PCB's put together though waiting for a couple of missing components - I am planning to put all the electronics in a server rac

by mikefazz - Reprappers

Aurdiuno Breakout board - 17 years ago

So I got the electronics kit w/o arduino and w/ sanguino. So the kit has the breakout board for the arduino which I don't have. Anyone want the breakout board? How about $15 since it is $25 on rrrf. I would like to go to one of the SRS meetings but Saturdays in winter are usually taken up with skiing

by mikefazz - Washington, Seattle RepRap User Group

Re: Washington, Seattle RUG - 17 years ago

Hey all, So thought I would make my presence known. I got the electronics a few weeks back and have been assembling a few a week as time permits. My goal is to get a working RepStrap and possibly then making a normal reprap. I may also try to make mine do some light machining. My background is in ME so I am glad all the EE stuff is already 'done'. My hope is to use the 80/20 I have for most

by mikefazz - Washington, Seattle RepRap User Group