Joe's CNC Model 2006

[Lionclaw]

Originally Posted by joe2000che recieved my LoveJoy couplers today to go from the 1/4" Motor shafts to the 1/2"-10 Leadscrews, These things are tough to put together...

Joe, where did you order those from? I've never seen any where the spider sticks out past the coupler. Those spiders might have been made for a larger coupler.

[sdantonio]

Hi Joe,

Do you (or anyone else following this thread) have any experience with using oil impregnated bronze bearings as slider bearings? I see you made yours out of what looks like HDPE, I have seen some people make them out of wood (which doesn't seem like it will make a very good bearing to me). McMAster-Carr sells the oil impregnated bronze for about $5 each (though they have some going as high as $30 if you want them to have grease grooves cut in them.

[joecnc2006]

Originally Posted by sdantonio Hi Joe, Do you (or anyone else following this thread) have any experience with using oil impregnated bronze bearings as slider bearings? I see you made yours out of what looks like HDPE, I have seen some people make them out of wood (which doesn't seem like it will make a very good bearing to me). McMAster-Carr sells the oil impregnated bronze for about $5 each (though they have some going as high as $30 if you want them to have grease grooves cut in them.

I have never used any, mine are tight enought but slide with a little sillicone spray.

[joecnc2006]

The X-Axis Carriage finished and painted.

You have to make sure the bearings are installed before assembling and glued together, I painted the pieces seperately the areas that would be on the inside, making sure not to paint the cut groves and outside edges of pieces so the glue would adhere to the wood for a tight bond. then used news paper to mask off the bearings aqnd then painted the outside.

[joecnc2006]

Inside the Z Axis Slide.

[joecnc2006]

Here is the gantry together and Like (Lionclaw's suggestion) I will be installing 4 threaded rods all the wat through it left to right. The Z-Axis slide is just a little tight so i need to adjust it a little. (maybe hollow out the bearings ever so slightly). Total weight 77lbs right now and it is pretty well balanced just slightly more to the rear.

[Jason Marsha]

Good work Joe.

Jason

[Lionclaw]

It's looking awesome Joe. It looks like you managed to get your hands on some nice galvanized pipe? Or is it conduit?

Get cracking on that table! I can't wait to see how your double rail system works out

[joecnc2006]

Thanks, Jason

Originally Posted by Lionclaw It's looking awesome Joe. It looks like you managed to get your hands on some nice galvanized pipe? Or is it conduit? Get cracking on that table! I can't wait to see how your double rail system works out

It is the galvanized gas pipe from Lowes, just a tad more expensive than the black, but i did not want the paint on the pipe to affect the accuracy as it wears even tho its would be very slight and i think it looks better.

[mhiggins]

Joe,

You must have been drawing this one up before you even finished the last one.
This post probably belongs on the thread for your second machine but it doesn't look like that one is very active now.

I like your new design but your second machine is a little more along the lines of my current manufacturing capabilities. I have come up with an idea that might improve the old design for those who aren't quite ready to tackle this one. Since it used unsupported pipe I thought I could add a set of adjustable bearings inside the lower gantry to take some of the side load off of the pipe. This lead to a slightly more complex idea of building torsion box gantry sides with three sets of bearings.
See my drawings. (I only have one of the horizontal setup the other two didn't survive the floppy disk transfer from work to home.)

Since then I thought it might even be useful in a design like your current one. Maybe a supported top rail with an unsupported lower rail fully captured in the lower gantry torsion box.

Just throwing out some ideas for review.

Mike.

[joecnc2006]

Originally Posted by mhiggins Joe, You must have been drawing this one up before you even finished the last one. This post probably belongs on the thread for your second machine but it doesn't look like that one is very active now. I like your new design but your second machine is a little more along the lines of my current manufacturing capabilities. I have come up with an idea that might improve the old design for those who aren't quite ready to tackle this one. Since it used unsupported pipe I thought I could add a set of adjustable bearings inside the lower gantry to take some of the side load off of the pipe. This lead to a slightly more complex idea of building torsion box gantry sides with three sets of bearings. See my drawings. (I only have one of the horizontal setup the other two didn't survive the floppy disk transfer from work to home.) Since then I thought it might even be useful in a design like your current one. Maybe a supported top rail with an unsupported lower rail fully captured in the lower gantry torsion box. Just throwing out some ideas for review. Mike.

that would help some left to right as the gantry would be pushing on both pipes instead of one in any given direction.

like to see more when you get it.

[mhiggins]

Originally Posted by joe2000che that would help some left to right as the gantry would be pushing on both pipes instead of one in any given direction.

I'm still in the early planning stages and the design may change a few more times before I actually start building.

One of the things I really like about your second design, and this one, is that the bearings are outside the rails rather than inside like the original JGRO. This would appear to increases the Y-axis travel without increasing the overall width of the machine. I probably won't end up using the vertical torsion box idea since that will take up a lot of my Y-axis travel with the extra thickness. I have a limited overall size that I must maintain if I ever plan to get my truck back in the garage.

I have gotten a ton of ideas from this thread and your previous machine. I'm anxious to see the table for this one.

Keep up the good work.