RepRap Part Drawings
I have had a few requests for the part drawings for the machined bits of my RepRap.
I have the RepRap completely wired up and everything – but I’m having loads of trouble getting the extruder to work. Since I am an extremely early adopter of the new RepRap design there appears to be an unfixed bug with the code/hardware that prevents the extruder stepper motor from getting the current that it requires. I hacked together a quick fix that *seems* to work (pictured below) but haven’t had time to really test it. Hopefully I’ll have some time over the thanksgiving holiday.
Categories: RepRap, Uncategorized
Thanks for the prints! Was going to start making .pdfs of my own parts as I complete them, but no need for that now!
Oh, link is incorrect – use this one instead: http://www.mechanicallyinclined.net/images/REPRAP_PDFS.zip
Thanks for the heads up – link fixed. I hope you find them useful!
Hello, I know you’re busy, but some of the drawings are missing dimensions, and I would really appreciate it if you could give us a hand, instead of us guessing.
x-axis belt clamp: I’m guessing the tapped holes are 2-56, and the untapped ones are big enough to allow 2-56’s to pass through.
x-axis carriage bottom: how wide is it? Or is that irrelevant?
y-axis pulley block: how deep is it?
extruder body: Maybe it’d be good to note which side the side holes go into, even though you’ve moved onto a different design?
Finally, what are your distances between all the parts?
Thank you very much.
Also, do you have any resources on how to use tooling balls?
Thanks again.
@thenoviceoo
Hello, I apologize for the incomplete drawings. I don’t like to post incomplete information. I plan on fixing them as soon as I get some time. Here is some information.
-X axis belt clamp – yes the top holes are tapped 2-56, the bottom holes are 2-56 clearance fit; they interfaces with two holes on the side of the x-carriage bottom half
-x axis carraige bottom width is very critical. I remember drawing that dimension in by hand when I made the part because I forgot to add it. It is 2.362″ wide. Note that the holes on the angled surfaces on the x carriage bottom are in the x_carriage_bottom_tooling_measurements pdf
-My y axis pulley block is .3125″ thick (5/16) The thickness isn’t very critical; I made it out of stock I had on hand
-On the extruder body drawing I squeezed two parts in – the top right drawing is the extruder carriage spacer (2 required). All of the holes are through except the two 4-40 holes on the bottom (which are .500″ deep, but that depth isn’t critical so long as you can get your screws in all the way. The slots on the front and back are to the depth stated in the drawing.
Take note that my extruder design isn’t particularly good. I would really like to redesign in (it is what keeping my reprap from printing). If you can get enough torque out of your motor it should work though. (I can’t confirm that any motor other than a nema 14 will fit)
Sorry to leave you guessing – I know it usually has bad consequences. I just whipped out the model and am in the process of making a dimensioned drawing of the part spacing. I’ll have it momentarily. Do you have a copy of Autodesk Inventor 2010? I would be happy to send you the model.
http://mechanicallyinclined.net/images/Full%20Assembly.pdf
There’s a dimensioned overview drawing. I’m sorry for the awful drawings/model etc. There is a lot about the machine that needs to be improved. I’ll post them when I make them – with good drawings too. They will be pretty easy things to change such as the extruder and the bearing setup on the y-axis.
Tooling ball use… That’s a tricky one. They seem to be a pretty obscure piece of tooling. You might find some information at some of these links:
http://www.toolingballs.com/
http://www.jvd-france.fr/anglais/pdf/sdcsd_uk.pdf
The second link appears to be the most useful. A brief explanation of the tooling ball is that it is used to setup a reference point in space that you can indicate to regardless of the part orientation (within reason). So for example on the x carriage bottom plate, when I clamp the plate at the desired angle on a sine plate the part is at an angle so there isn’t any thing to accurately indicate to the the vertical and the axis that the part is angled.
Using a tooling sphere allows me to indicate concentrically to the sphere so that I am centered over it, and to touch off the top of it with my end mill (I actually place a shop gauge block on top of the tooling ball and touch off the top of that then subtract out the thickness of the gauge block.) This accurately sets all three of my axis to a convenient reference point that is dimensioned from as necessary in the drawings.
I hope that makes sense. I use a dial indicator placed in the drill chuck to indicate circumferentially to the tooling ball. Once you are indicated its pretty easy. Hopefully you have a digital readout on your mill otherwise it could be a headache.
The tooling ball is used the same way for the corner brackets. Hopefully from the drawings its use is clear.
Let me know if you have any other questions!
Hey, no problem! Incomplete is better than none: there still aren’t enough full mendel RP parts flying around, so the chance we’d score one is pretty low; getting a start on machining parts feels more proactive, and we’re leaving the extruder work to the end (hopefully, we come up with something that works).
And thanks for pushing out a dimensioned drawing: we’re not even halfway through the machined parts, but I wasn’t sure how often you’d check the blog, so I decided to make sure we had working dimensions on hand.
And thanks for the explanation: it’s not a good thing when your machine-shop aficionado professor looks at you strangely after you’ve asked him how to use a tooling ball. Well, I don’t have a digital readout: looks like headaches will be in my future.
Just to let you know, I’m doing *some* work on the reprap metal mendel wiki http://objects.reprap.org/wiki/Metal_Mendel
best of luck with school and reprap-related work
Quick question: the three screws sitting around the sunk z-axis rod bearings are meant to hold the bearing in, or serve some other function? I may have just killed my part by drilling too close to the bearing hole, but if that’s all the holes are doing it might be salvagable (I can’t tell if they serve that function from your pictures)
Thanks!
And, for the z-axis bearing plate (not the motor mount), the bearing sink seems to be drawn as hidden: does this mean the bearing should be sunk on the opposite side? I think the only thing this effects is on the holes drilled on the side.
The three screws sitting around the counterbore for the bearing are indeed to hold the bearing in place. The head of the bolts should rest upon the outer lip of the bearing. The holes will be VERY close to the bearing. I thought I had drilled too close when I made the part as well.
The z-axis bearing plate is designed to have the counterbore for the bearing on the top. If you build it so the bearing is placed in from the bottom it will mess up the alignment of the belt and pulleys underneath the plate (not as much room)
If you made the part so that the bearing is inverted, you could salvage it, it probably would just take a bit of design modification. By the way sorry for my late reply, been working around the clock for a robot competition
You post awsome posts. Bookmarked !