What size drive screw? - CNCzone.com-The Largest Machinist Community on the net!

xairflyer · #1 01-04-2004, 06:24 PM

I have both 6mm and 8mm stainless all thread that I can use for my drive screws.

Is a fine thread (more tpi) not better than a large say 1/2 screw with less threads ?

I would have thought my 6mm 26 odd tpi would give me a lot more acurate cuts or am I looking at this total wrong.

balsaman · #2 01-04-2004, 07:23 PM

Yes and no. The lower pitch screws do a few things. One is increased force. This at the expense of some speed. Another is increased resolution. Do not confuse this with accuracy. Even with 10 TPI screws and 200 step steppers running at full step you will get .0005" per step. Your machine, even if very tight, will have more slop in it than that, so going to a finer pitch will not improve the accuracy of the machine.

Either screw will work fine. I would use the coarser one, just to get a little more speed.

Eric

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
size of drive for enitre unit	CNC Darren	Servo Drives	0	03-20-2005 11:53 AM
for engraving pcb which is a good thread size for the lead screw?	NickLatech	DIY-CNC Router Table Machines	11	01-17-2005 08:37 PM
size of 4th axis drive	converterk	AjaxCNC Control Products	10	06-07-2004 10:01 AM
Belts versus Direct Drive	bsmith	DIY-CNC Router Table Machines	12	06-06-2004 10:09 PM
drive screw sizing	Dan S	DIY-CNC Router Table Machines	2	11-09-2003 07:02 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)