Hi, i'm making a repstrap with threaded drives and am having trouble figuring out what size thread i should use. I remember reading about .5mm accuracy, does this mean i should go with M3? https://reprap.org/forum/read.php?14,32474,32474#msg-32474 Fri, 07 Aug 2026 07:24:37 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?14,32474,34533#msg-34533 https://reprap.org/forum/read.php?14,32474,34533#msg-34533 > firmware configuration to set steps per mm, which
> totally glosses over drive methods and such.

ReplicatorG uses a file: machines.xml. In there you will add your machine and its attributes. There you can tell it the number of steps per mm for the X, Y and Z axis.]]> bjbsquared Mechanics Sun, 31 Jan 2010 07:14:18 -0500 https://reprap.org/forum/read.php?14,32474,32540#msg-32540 https://reprap.org/forum/read.php?14,32474,32540#msg-32540 mlagana Mechanics Mon, 11 Jan 2010 08:08:31 -0500 https://reprap.org/forum/read.php?14,32474,32538#msg-32538 https://reprap.org/forum/read.php?14,32474,32538#msg-32538
as far as I know, there should be somewhere in the firmware configuration to set steps per mm, which totally glosses over drive methods and such.]]> Triffid_Hunter Mechanics Mon, 11 Jan 2010 07:03:34 -0500 https://reprap.org/forum/read.php?14,32474,32529#msg-32529 https://reprap.org/forum/read.php?14,32474,32529#msg-32529
in the past i constructed one for manually controlled stop-motion camera moves,if i go this way after i have printed mendel parts i can't make, i can use the cartesian bot as a motion control system with openMoco (i'm an animator)

so if i make it with m5 thread, with a pitch of .8mm, does that mean my 3d designs would come out larger? Or does the reprap software compensate for this and they are just less detailed?

my X axis is going to be around 800mm (for the motion control unit) so i guess i will have to put the opto stops much further in while reprapping.]]> mlagana Mechanics Mon, 11 Jan 2010 01:08:23 -0500 https://reprap.org/forum/read.php?14,32474,32518#msg-32518 https://reprap.org/forum/read.php?14,32474,32518#msg-32518
thanks again]]> mlagana Mechanics Sun, 10 Jan 2010 23:24:51 -0500 https://reprap.org/forum/read.php?14,32474,32501#msg-32501 https://reprap.org/forum/read.php?14,32474,32501#msg-32501
As Wade said, belt or rack and pinion is probably better.]]> SebastienBailard Mechanics Sun, 10 Jan 2010 21:29:20 -0500 https://reprap.org/forum/read.php?14,32474,32479#msg-32479 https://reprap.org/forum/read.php?14,32474,32479#msg-32479 Wade Mechanics Sun, 10 Jan 2010 15:39:27 -0500 https://reprap.org/forum/read.php?14,32474,32474#msg-32474 https://reprap.org/forum/read.php?14,32474,32474#msg-32474
i'm making a repstrap with threaded drives and am having trouble figuring out what size thread i should use.

I remember reading about .5mm accuracy, does this mean i should go with M3?]]> mlagana Mechanics Sun, 10 Jan 2010 13:32:45 -0500