New DYI Fixed Gantry Router Build

**DonFrambach** · 11-07-2010, 08:19 PM

Cut the relief to regain full Y axis travel. The screw heads now clear the bearing block.

**DonFrambach** · 11-07-2010, 08:45 PM

Discovered another problem. The motor coupler that I purchased from CNCRouterParts.com is too wide to clear the 1/4" steel plate as I mounted it on my Y axis. The mount works just fine when the steel plate is offset from the mounting block as designed by CNCRouterParts.com. Clever me thought that it would be better to have the steel plate hold the smaller 8020 parts in alignment.

I was about to remove the portion of the steel plate that interfered but fortunately discovered that the parts from DumpsterCNC.com will fit over the plate. I purchased a motor coupler and two shaft couplers from DumpsterCNC.com.

The photo below shows an aluminum motor coupler from CNCRouterParts.com and a delrin motor coupler form DumpsterCNC.com

**DonFrambach** · 11-07-2010, 08:52 PM

Assembled the Y axis. Good news and bad news.

The good news is that I have 14" of Y axis travel.

Bad news is that I can't make Y axis moves faster than 30"/minute. At faster rates, the Y axis makes a terrible buzzing sound. Could I ask more knowledgeable folks a couple of questions?

Is the buzzing sound caused by lead screw whipping?

I have a 1/2" 10 tpi single start lead screw. Would I be better off with a 1/2" 10 tpi 5 start lead screw which would increase travel 5x for each turn of the lead screw?

**harryn** · 11-07-2010, 09:39 PM

Hi, most likely it is the stepper motors. At some frequencies, they will go into an oscillation / buzzer sound. Search for dampers on the forum, there are plenty of experiences with this.

**chimpera** · 11-07-2010, 09:39 PM

screw whip shouldn't be a problem. Try setting your acceleration really low. Otherwise its a matter of to much friction on the rail, or the screw. Is the g540 picky about the pulse length coming from the pc?

**DonFrambach** · 11-07-2010, 10:52 PM

Thanks! It was friction between the leadscrew and the delrin nut. With a little lubrication I'm up to 75"/min. Here's a YouTube video:
[nomedia="http://www.youtube.com/watch?v=0XNEnUm6S0w"]YouTube - Y axis movement.MP4[/nomedia]

**DonFrambach** · 11-09-2010, 01:01 AM

Z axis is assembled. There is about 5" of Z axis travel.

**acondit** · 11-09-2010, 10:38 AM

Don,

I was having problems with the Delrin nuts on my router, and a little lubrication solved my problems also.

Alan

**DonFrambach** · 11-09-2010, 10:49 AM

Alan,

What did you use to lubricate?

Don

**acondit** · 11-09-2010, 04:57 PM

I used a little tube called SuperLube. It has polytetrafluoroethylene (PTFE) , a strong, tough, waxy, nonflammable synthetic resin.

It works really well. But CarveOne and Khalid have given me a couple other ideas. CarveOne suggested Dupont's "Teflon Mulit-Use Dry, Wax Lubricant" spray. It sounds pretty good also. Available at Lowe's.

Alan