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Thanks, Mark. I was hoping you could incorporate some of these ideas into a V2 kit. Contact me if you want to collablrate further on this.

MG

 

You should be able to generate a parts list from the Sketchup model just by making a manual list. Just go through the model and write down all the parts used. I don't use BOM's because I am a custom builder and have an extensive stock of parts, so I just go get what I need off the shelf.

I did notice that someone revamped the model to include names for all the parts. I have not looked at this SKP file to see what is different. Also, I have made some changes to the SKP design since doing this build, as a result of the build. I have not included these changes in the SKP file yet.

Edited Model: CNC design (parts named)

MG

 

Nice job! Although you could have made your table a lot bigger to take advantage of the extra travel. You can always do that later. Or, go with the v-slot table.

Also, you can put your wheels closer together to make the rails stick out a bit less front and rear. Shouldn't affect the stability much.

Now, get a dial gauage and dial in the table for flatness.

MG

 

As much as you want. Just move the Z axisup for more clearance. You can adjust it right up to the bottom of the gantry plate. I also used the CBXL gantry plate on the X axis as well as the Y, and the Z axis just bolts on with 4 screws.

I may have forgot to mention that I made the C-beam side supports 50mm taller than the original so I could have extra clearance.

MG

 

You could raise your X axis beam up another 20mm by putting cast corner brackets on top of the C-beams at each end instead of the flat 5 hole corner plates. That way you are still supporting the X axis c-beam but it will be 20mm above the top of the vertical c-beams.

Also, with the aluminum table, you could also probably get away with 1/2" MDF spoil board as well, giving another 6.35mm of clearance. That's over an inch of extra Z axis travel total...

And Kevin Kuehn, you have the Sketchup model, and Sketchup has a tape measure... We don' need no steenkin' parts list Or, you could volunteer to do up a BOM, I think there is a way to do it in Sketchup, but I've never tried it.

MG

 

Hey Pedro:

Your link above did not work so I am not sure which ones you are referring to. The ones I use are from SainSmart, and are pretty reliable:

Single-Axis CNC Stepper Motor Driver Controller, TB6560.

They have a stocking warehouse in the US.

Note that the switch settings are shown by the silkscreen on the board, and NOT the indication printed on the switch itself. Set the Decay mode for the quietest operation of the motor, you will find that the motors can be set to be extremely quiet running using the decay mode switches.

Also, these can be set upt to 3A, so if your motors are 3A or 2.8A max current you are set.

There are lots of similar ones on eBay like this:

I would NOT recommend the ones that look like this:



As they are cheaply made, have a small heatsink, and are difficult to mount. Also, in some cases, the heatsink and mounting holes are not isolated from the electrical circuit of the board, so if you use metal hardware to mount them onto a metal plate they go up in smoke.

Hope this helps.

MG

 

Just cost. I was trying to keep the costs in line with the original machine. My own personal machine has linear rails on it.
Also, it's a lot easier to get the table level with the X axis, with the linear rails you have to use shims, with the wheels it's a simple adjustment.





This photo was taken before I upgraded to C-Beam verticals for X axis support. I lost about 40mm of X travel, but the machine is a lot stiffer. This machine now also has a double wide Z axis gantry plate with a double router mount, and CBXL gantry plates on X and Y, instead of the universal build plates.

Below is a photo of the last machine I built using the wheels, c-beam uprights, and a v-slot table.



MG

 

Sure, Gray, here you are:
















These are all the photos I have, so I stuck in a couple of renderings from the Sketchup model. The model is available in the build:

Improved CBM

I have to do a couple of updates on the model, I will try to put it up a bit later.

MG

 

This post is 3 years old. There will be no more updates. See CNC design (parts named).

My latest Sketchup file is included.