Hardware / Nuts / Rods

Mostly Printed CNC - MPCNC Hardware Development
1

Hello Guys,

I am starting on my build of the CNC machine.
I would like clearifcation on the hardware parts needed.

1 5/16-18 Threaded Rod M8
I seem to find metric hardware more online the imperial.
What length of the M8 rod should be?

Is the other ones below rods also?
1 5/16-18 X 5 M8 X 130
12 5/16-18 X 2.5 M8 X 65
2 5/16-18 X 1.5 M8 X 40
28 5/16-18 X 1.25 M8 X 30

Any pictures of these to help me get the correct ones?
Also any place recommended to get them from? best deal?

43 5/16-18 Nylock Nuts M8
1 5/16 x 7/8 coupling nut M8 X 25
19 M3 X 10 M3 X 10
57 #6-32 X.75 M3.5 X 20
57 #6-32 Nylock nuts M3.5

Thank You
Sidney

2

The threadscrew length is determined by your Z axis, the metric calculator can give you that number.

1 5/16-18 X 5 M8 X 130
12 5/16-18 X 2.5 M8 X 65
2 5/16-18 X 1.5 M8 X 40
28 5/16-18 X 1.25 M8 X 30

These are screws, you can either use 5/16-18 with the length in inches or the M8 with length in millimeters. So you need one screw 130mm long, 12 that are 65mm long, etc.

Same on the rest, 43 nuts for screws, a single special nut for the threadscrew (8M and longer than the normal nut). The M3 x 10 screws are for mounting the steppers and really do need to be that. If you can’t find M3.5 hardware you can likely use M3, but be prepared to add washers if the screw heads and nut size are close to the hole size. Structurally they have plenty of oomph.

3

Thank You Bill

4

Does the head matter?
is the spec for Machine Screws?
want to make sure design doesn’t require a hex bolt head.
Would Socket Screws work just as well?

Thank you!
My prints will be done in a day or two.
just building my shopping cart.

5

Most anything will work. specs on the parts page.