Lead Screws!

I recently bought and received three lead screws from precisiontechmachining on ebay. I got two 18in and one 24in long 3/8-16 lead screws. They each came with a delrin nut which seems to work nicely. Unfortunately, the 24in one seems to have been damaged in the mail. I am trying to see if they will replace it.

It fits nicely between my linear bearing rails!

The ends are turned 5/16in. The 6mm ID skateboard bearings I have fit snugly. I might have to invest in angular contact bearings though.

The damaged 24in screw. It is not bad however it could cause significant whipping.

V2.0 3D Model Continued, Theory Tested

I found some time this weekend to continue the development of my new and improved V2.0 CNC machine. Unfortunately, with my current machine I am unable to cut some of the pieces of V2.0 so I had to divide those pieces into smaller pieces that my current machine can handle. Check it out! Let me know what you think!

I used my existing CNC machine to cut out one of the bearing pieces to see how my machine does and see how the bearing concept works. It actually turned out fairly well. There is some play in the bearings however I think that I can adjust the bearings to eliminate the play. So far so good!

Backlash Fixed! Conceptual 3D model Started

I fixed the backlash in my v1.0 machine. It turned out to be as simple as adding another bolt to my lead screw nut to keep the nut from turning while applying a force to it. I re-cut the test pattern and my machine seems to have no more backlash, well at least no significant backlash.

So, I started drawing up the 3D model of my next machine. This design will be significantly more rigid by using the 3/8" steel V groove bearings and aluminum or steel extrusions for the rails. Check out the Z and Y axes:

I am having trouble figuring out how to support the ends of the Y axis. Any Ideas?

Backlash, Version 2.0 Design Concept

So I have backlash! I did not know how to measure it until I posted over on the CNCZonne. It was suggested that I cut a pattern in an attempt to figure out my backlash problems.

Backlash measurement pattern.

So I cut out he piece and measured it. It turns out that I have zero backlash in the Y direction, however I have 0.0155in of backlash in the X direction. I then examined my machine and found the cause to be my lead screw nut. It seems to have significant play. I will have to make another nut and see if that eliminates my problems.

backlash test piece, two 1" squares joined together.

I also have been working on a proof of concept for my next machines linear bearings. As I said int he previous post, I recently bought 3/8" V groove bearings. I used my CNC machine to cut out two end pieces out have a cutting board to hold 3/4" aluminum square tubing. It seems that this concept will work well! The two aluminum rails are extremely parrellel, only varying from one end to the other by a few thousandths of an in! If I correct that backlash problem I have, it could be even better!

This new machine is going to be awesome!

Workbench/Plans for CNC V2.0?

So, I have moved recently and finally have built myself a proper work bench to set up my CNC machine on, instead of the floor! Check it out, it is nice!

Also, I have been working on plans for my next machine! I am planning on using 3/8" steel V-groove bearings for the linear motion system, which I just happen to win 16 of them off Ebay! I am currently working on a drawing and will post it when I have completed it. They should defiantly be better then skate-board bearings!

Fishy!

Just for fun, and to prove to my fiance that the machine could make cool things, I drew a fish in GCAM and generated the gcode. Check it out!

First Part: Arduino Prototyping Board with video!

I decided to make my first part! I recently got an Arduino Uno to start playing with and eventual use to make something cool! Anyway, I wanted a simple prototyping platform so I used GCAM to generated some gcode to cut a piece of cutting board that I could mount the Arduino on and a small prototyping board. I actually managed to cut the part with no problems on my first try! Check it out.