Gathering ideas for a new CNC router-mill thingy

[Davek0974]

If i use full 400mm front plate i can space blocks much wider which i think is generally a good thing?

[Davek0974]

If we bring in the plates that are fixed to the rear side which connect the X axis carriages to the gantry rails, it works out very nicely i think - the plates are directly connected to the z axis carriage positions.

Plates are dimensioned as 15mm. bottom two are the gantry lower/upper sides and top one holds the z motor

[Davek0974]

Metal arrived today, will be on the mill this weekend i think :)

Ballscrews - with a stepper drive system and 1610 screws, is it allowable to let the nut hit the BK/BF blocks as a means of hard-stops or do i need to also fit physical stops before they hit?

The machine will have full limit switches so will not be ploughing into the ends too often hopefully ;)

[JAZZCNC]

If we bring in the plates that are fixed to the rear side which connect the X axis carriages to the gantry rails, it works out very nicely i think - the plates are directly connected to the z axis carriage positions.

Plates are dimensioned as 15mm. bottom two are the gantry lower/upper sides and top one holds the z motor

Dave Think you have been got by Classic Gotcha.?
How are you going to access the holes for fastening the rear plate to the bottom bearing plate.? The Z bearings fasten from back side so can't fit when rear plate is fastened. You'll need to Lift the bearings so can access the bolts.

[Davek0974]

Dave Think you have been got by Classic Gotcha.?
How are you going to access the holes for fastening the rear plate to the bottom bearing plate.? The Z bearings fasten from back side so can't fit when rear plate is fastened. You'll need to Lift the bearings so can access the bolts.

....Scurries off to grab the drawings............

[Davek0974]

Ok, it definitely seems to work for me



Assembly would be to screw the x axis support plates on at the bottom and middle positions, then there is just enough clearance to pass the screws from the back to the front to mount the Z axis carriages, bottom line is tight but room should be ok.

[Davek0974]

Build log started here...

http://www.mycncuk.com/threads/9577-...7182#post77182

[Davek0974]

Ballscrews

Never used these before, the motion stuff arrived today :)

Questions...

Is it normal for the BK/BF end support bearings to be a press-fit? (Don't want to go forcing and break something.)

Do the nuts have to remain fitted or can they be removed without losing all the balls??