some how I forgot to publish my build.....oops..........we did a little more work Saturday here is a few more pictures.
I added one of the many bearings I looked at, the one on the left is what I am using the center is the same size as the store except flanged and the one
on the right is from the store. The nice thing about the flanged bearings you don't have to do a pocket cut and if the bearing doesn't fit just do a little sanding for the clearance. the collar I got form global industrial. my build uses the one on the left. next is to wire up the switches and a jack for
the z touch probe

 

thanks mark, I was just sitting there looking at how to route the hose and power to the spindle, hade some 20x20 and just started laying it out in my head and came up with it. most cnc's I have seen
have the hoses attached to a ceiling with a spring, since mine is on wheels I think this is better... at least till something goes boom

 

worked on the vacuum dust shoe late yesterday, tested it in wood then cut out 1/2 acrylic. not sure if the screws will hold on to the rare earth magnets I epoxied onto the upper aluminum. if not I will
try and center it up and re-pocket it for the 12mm magnets.

 

I cut aluminum at .397mm , 18500 rpm at 50 ipm, the acrylic is 1mm 24500rpm an 67 ipm. I am using a single up cut spiral bit .118" dia form ebay, cost less than 2 bucks each. just ordered 10 for 12 buck from Hong Kong , still have 10 but getting spares, I cut most of my plates with just 1 bit...but these are so cheap you can toss after a couple large cuts. I broke 4 of the $30 amana bits before david helped me with the formulas.
expensive lesson.

 

looks like it is going to hold, I tapped the holes for the low profile screws had extra 6mm ones and set them just above the surface so they would have good contact with the magnets. got the magnets at home depot, 12mm x 3mm.

 

10PCS 1/8" Carbide Flat Nose Endmill CNC Router Bits Single Flute Spiral 17mm

10Pcs Double 2 Flute Carbide CNC Router Spiral Bits Cutters 1/8" 3.175 x 22mm

I haven't tried the 2 flute , figured they were cheap enough to try.

banggood.com has them also, $1.79 each plus they have others. but most of the time ebay is cheaper

cnc end mill - Buy Cheap cnc end mill - From Banggood

 

found the first batch I got
10pcs 1/8 Inch Shank 1 Flute Carbide Spiral End Mill Cutter 3.175x25mm


they are 1/8 shank but .115-.118 bit diameter

 

check a couple posts up I posted what my speeds and feeds are for acrylic and aluminum using that bit

 

the overhaul was mostly time and the cost of the aluminum, I cut everything out of 10 x 14 inch 6061-t6 plate so maybe $60 in aluminum. my original plate were scraps from our test lab, overall it a little over $1000 for the build. I don't include tool I bought since I just add them to my collection.

 

we have done some, it has stayed within a few thousands, but you have to remember that this is a DIY hobby machine, if you are doing wood and acrylic you will never notice it, there is some backlash also.
the only way to get a tighter machine is to build a ball screw rail system and get rid of all the wheels, belts and acme screws.

 

did some more work this week and today, the screws in the shoe seem to hold ok. but if you put magnets on both it takes lots of effort to pry apart.

got everything into the pelican case and the connectors on, still have the z probe and limit switches to wire up.

 

we got rid of a lot of flex with the added wheels added on the back, with yours it looks like it is really high off the spoil board and using the openbuild 1/8" plates. I started out like yours then had the machine build
its own replacement plates. every think on mine is 1/4" 6061-t6. my next rebuild will replace the wheels with bearing guides. I am finding that there is some wiggle in the wheels, some have more than others. if
you are doing wood projects the amount of slop most likely will not be noticed. I posted a bunch of pictures , take a close look and if you need a better look at something I can post a different view of it to help you out.
I also posted all the sketchup files also.
Robert

 

OH snap, this ole Tennessee Hillbilly is getting 15 min of fame ....