MyRCCar Dogbone Making Tool by dlb5

Last crawled date: 3 years, 1 month ago

MARK, CUT, DRILL, SAND and RUN with your 3d printed rc car!!!
Emmm... what?¿? with a piece of plastic?¿?
Ok, this is a tool to help you measure and mark, drill and hold your dogbones and pins while sanding them.
To use it, you should go as follows:

First of all would be to mark a 5mm piano wire to be cutted at the desired length. For this, use the convex surface to place the piano wire starting in the "0", then use the "ruler" to position your pen tip at the desired length or nearest one. You can do this always by hand with a ruler and a pen, but you should be able to rotate the piano wire over the convex surface while holding the pen in position to draw a circle around the wire. After that you can introduce it in the 5 mm hole to hold it with the 2 M3 screws in place to help you cut it. The selector button must be near the side to allow the 5mm wire to go through the tool.


Second, after cutting the 5mm piano wire to the desired length (must be dogbone extreme to extreme distance) you must drill both sides to be able to introduce the pins. For this, you must put the selector button in the "drill position", introduce the cutted 5mm wire from the left side till touching the selector button and then fix its position with the 2 M3 screws.


Drilling with the 3mm bit over a 5mm piano wire wont be easy, and if you try it just holding a big drilling machine it will be really hard, also previously marking the place for the pin. So i think i have quite a nice solution: The tool and its two 3x10x4 bearings shoud help you perfectly align perpendicular and centered where the hole must be. The bearings can rotate with the drilling tool and maybe they shoud allow a little of perpendicular force deviation while drilling.


One time you have your dogbone with its holes, you must take the 3mm piano wire and mark and cut it twice for each dogbone with the provided 10mm and 12mm depth holes. Introduce the wire in the hole and mark arround it to cut it after that.

It's a good idea to sand the "heads" of th main piece trying to give it a half-spherical shape. For doing this you can put the select button in the sanding position and use the thumb button to avoid the dogbone to turn while you push it against a sanding cylinder. You can also introduce your cutted pins in the 3mm or 2mm holes to sand their "heads".
If you can't access 3x10x4 bearings maybe you can use 5x10x4 ones and the provided adaptor. The idea is that the walls of the adaptor or the bearing turns all together, so you shouldn't damage them much.
Needed Material:
2x 3x10x4 bearings or 2x 5x10x4 + adaptor
2x M3 Hex Socket Head 16mm or longer screws
Dremel like machine with cutting disk, sanding cylinder and if possible 3mm drill bit.

Protection Glasses

If you plan to use this in a MyRCCar config with printed FR diff vases, they should be compatible. A 1/8 center diff also uses 3mm pins but if you don't glue the pins and pray they could get shooted from the car. I made some covers for this 1/8 center diff vases so the pins shouldn't get shooted. If you are interested in this addons please tell me and i'll publish them.
As always, i encourage you to join the MyRCCar Group if you are really interested in the project.
Also, if you are using 02024+converter as center diff. You will need 2mm pins and holes for this side of the dogbone, so maybe you would use the 2mm adaptor for 5x10x4 bearings to use a 2mm drill bit. There is a special 2mm hole to hold the pin while sanding the extremes.
Do the drills over a "martir" table, so, one time you have drill the backpart of the thing you don't drill the floor or something undesired.