@uncle_bob: I would advise against A2's method for locating the holes. (Sorry A2.) I would use this technique to lay out your holes. No math required and less of a chance for roundoff error to mess you up.
I actually take it a step farther. Set your compass using a ruler. You want to be close but in the end it just matters that all the holes are evenly spaces so don't stress this part too much. You can play with the screw spacing value in the software. So you set your compass. Set you compass and draw a quarter circle. Pick a point low on the quarter circle and swing an arc to intersect the arc you are on. To verify you did everything right go to that intersection and make sure you can swing an arc directly through the other two points of the triangle.
If you are going to do all three at the same time you need to make a few precautions.
*Screw them together so there is no chance of them moving relative to one another during the process.
*I like to label each of the corners A, B, and C for each of the boards. Assuming you aren't perfect this will at least ensure that you will have vertical screws.
*Drill a small guide hole. Disassemble and then drill the bearing socket followed by a screw clearance hole.
To get the hole pattern for the steppers, take a piece of paper and tape it on the back of a stepper. Do a pencil rubbing of the holes. Remove and place on the board in the correct position. Use a nail or a center punch to mark through the paper. When you drill feel free to oversize the holes. This will allow the stepper to self align before you completely tighten it.
Good luck!
@Dannydefe: Put you parts in the oven on low. Take them out every minute and tap on a hard surface. Listen for the tap to turn to a thud. At that point you can insert you bearings without cracking the plastic. Don't print the couplers yet. I am going to change them soon. Do you think I could order screws for me and have you coat them for me? That would help with the backlash and they would look awesome.
I think we can make our own tap. Heat it up with a torch. Put it on a lathe and taper it. Put it on a CNC mill and cut some grooves in it. (It sounds easy to me but I am not a metal worker.) Any one out there that is good at this sort of thing, please advise.
Also, there is some discussion going on in the ConceptFORGE forum about going metric. IGUS is the most likely candidate for being a worldwide supplier. The problem with these fast travel screws is that there is no standard. You have to get the screws and the nuts from the same place. (Don't worry about losing the imperial version. GitHub will save all that information even if I don't make a new branch or folder.
I actually take it a step farther. Set your compass using a ruler. You want to be close but in the end it just matters that all the holes are evenly spaces so don't stress this part too much. You can play with the screw spacing value in the software. So you set your compass. Set you compass and draw a quarter circle. Pick a point low on the quarter circle and swing an arc to intersect the arc you are on. To verify you did everything right go to that intersection and make sure you can swing an arc directly through the other two points of the triangle.
If you are going to do all three at the same time you need to make a few precautions.
*Screw them together so there is no chance of them moving relative to one another during the process.
*I like to label each of the corners A, B, and C for each of the boards. Assuming you aren't perfect this will at least ensure that you will have vertical screws.
*Drill a small guide hole. Disassemble and then drill the bearing socket followed by a screw clearance hole.
To get the hole pattern for the steppers, take a piece of paper and tape it on the back of a stepper. Do a pencil rubbing of the holes. Remove and place on the board in the correct position. Use a nail or a center punch to mark through the paper. When you drill feel free to oversize the holes. This will allow the stepper to self align before you completely tighten it.
Good luck!
@Dannydefe: Put you parts in the oven on low. Take them out every minute and tap on a hard surface. Listen for the tap to turn to a thud. At that point you can insert you bearings without cracking the plastic. Don't print the couplers yet. I am going to change them soon. Do you think I could order screws for me and have you coat them for me? That would help with the backlash and they would look awesome.
I think we can make our own tap. Heat it up with a torch. Put it on a lathe and taper it. Put it on a CNC mill and cut some grooves in it. (It sounds easy to me but I am not a metal worker.) Any one out there that is good at this sort of thing, please advise.
Also, there is some discussion going on in the ConceptFORGE forum about going metric. IGUS is the most likely candidate for being a worldwide supplier. The problem with these fast travel screws is that there is no standard. You have to get the screws and the nuts from the same place. (Don't worry about losing the imperial version. GitHub will save all that information even if I don't make a new branch or folder.