Arn's minimill cnc compact version

[Arn]

This is my just completed conversion,  thanks to all who share their ideas and pictures.  I tried to make it compact to fit inside my enclosure so I can flood coolant if I need to.

[Glenn]

Arn, good looking machine, what size motors are on your axis, oz/in. ?
Glenn

[zarzul]

Glen,

Thanks for the feedback,  I am using 270 oz motors, the belt drive hidden under the cover is a one to one ( no reduction on the x & y)  the Z which is a 5 turn/inch ball screw is belt driven with about a 2 to 1 reduction on the belt pulleys. 

Arn

[fignoggle]

hi arm-

looks good! did you also make a y-axis bearing block?

[zarzul]

Fignoggle,

Thanks for the reply,  yes I did make a y-axis bearing block,  I went kinda cheap with it though.  I just used 2 ball bearings and preloaded them to each other by shimming between the outer race.  This didn't leave much room on the stock leadscrew, just enough to get the pulley mounted.  Next time I take it apart to adjust or tune things I will take some pictures incase someone wants to do something like it.

Arn

[fignoggle]

Fignoggle,

Thanks for the reply,  yes I did make a y-axis bearing block,  I went kinda cheap with it though.  I just used 2 ball bearings and preloaded them to each other by shimming between the outer race.  This didn't leave much room on the stock leadscrew, just enough to get the pulley mounted.  Next time I take it apart to adjust or tune things I will take some pictures incase someone wants to do something like it.

Arn

hi arn-

that'd be great - always nice to see other x2 conversions

our y-axis block looks like this: http://www.fignoggle.com/machines/x2mill/howTo-upgradeScrewNutY.htm

are you using split nuts on the acmes on the x/y axes?

[zarzul]

Fig,

Yours looks a lot like mine, I must of gotten an idea or two from you.  Mine is a two piece construction also, the bearing holder is machined down to allow plenty of clearance for the y travel,  it is a little larger diameter so I have room to attach my motor mounting plate which also holds the bearings in place.  I haven't tried the split nut idea yet,  I am giving it some thought though.