Taig motor Q

[impact]

During continious duty, 3/8 endmill, 2nd pulley, after about an hour the motor stalls. Anyhelp? It is reltively hot but I dont THINK the motor is overheating...

[warpedmephisto]

2nd pulley from the top or bottom? What material? What feed rate/DOC? Is the motor stalling or is the belt slipping?

My guess is that its just heating up and losing torque as it does so, to a point where the motor stalls out. How does the machine sound when you're taking the cut at the beginning of the operation when the motor is at room temp? If it sounds like its struggling at all, you might want to reduce your DOC or feedrate.

Just for reference when I use a 3/8" 2 flute end mill in aluminum I usually run at 4300 RPM, 0.050" to 0.100" DOC depending on the width of cut, at anywhere from 5 to 15 IPM depending on DOC and WOC (with flood coolant).

[cartertool]

That sounds odd - the motor would trip if it's too hot, but if it's just stalling? Could be the endmill is bogging down in the cut somehow.
Coolant? Material? DOC, feedrate? Endmill dull?
This is the new 1/4hp motor not the old 1/8hp one?

[impact]

Its doing a plunge cut .065 depth total though it stalls very early.

From the top 7000 rpm I think.

1.7 IPM 2 flute.

The motor completely stalls no belt slip.

Synthetic flood coolant.

I thought it was a dull end mill but I switched to another one and same problem.

1/4hp motor.

The machine sounds fine at the beginning of the process.

I think it may have been because one of my splash deflectors broke and a small amount of coolant made its way into the motor, I am not certain though.

BTW are the x axis gib screws supposed to epoxied into the flanges? There is residue of something that looks like JB weld but mine are no longer glued together...

[warpedmephisto]

I've recently done a plung operation with a 2 flute carbide end mill on my Taig with stock 1/4 HP motor and here are my specs:

4300 RPM, 3 IPM, 0.125" deep. Cuts beautifully all the way to the bottom of the hole with no chatter or running the motor too hard. Thats still probably not feeding enough chip load per tooth, but it works for me. I think you're spinning it too fast and feeding it too slow. Make chips, not dust.

I don't believe my x axis gib screws were epoxied in place - they just had a locknut on them to hold them in place and to keep from adjusting themselves while the machine runs.

[impact]

Oh the plunge cut is making chips, perhaps I will speed it up a little.

What do you mean by locknut?

[cartertool]

Originally Posted by impact Its doing a plunge cut .065 depth total though it stalls very early. From the top 7000 rpm I think. 1.7 IPM 2 flute. The motor completely stalls no belt slip. I thought it was a dull end mill but I switched to another one and same problem. 1/4hp motor. I think it may have been because one of my splash deflectors broke and a small amount of coolant made its way into the motor, I am not certain though. BTW are the x axis gib screws supposed to epoxied into the flanges? There is residue of something that looks like JB weld but mine are no longer glued together...

Are you sure the endmill is centercutting? If not a plunge could certainly stall the motor. The motor is TEFC as far as I know so coolant shouldn't matter. The gib screws are not epoxied.

[impact]

Yes the endmills are centre cutting.

I have had troubles in the past with my x axis and the flanges not seating with the screw. There definatly is residue from some sort of epoxy inbetween the screw and flanges.

[cartertool]

I don't know what it could be other than just overloading the motor.
And the epoxy as well - haven't run across it...

[redrider9112002]

I have a problem with the motor turning off at 45min. or so into the program. Ive got the 1/4hp motor. IPM 5 at .2in. deep in 6061 alum. with the belt at the top. and I'm using a 3/16 3flute end mill. I'm new at this. The motor issue is kind of bothering me to. Maybe though I'm just trying to go to fast. I once pulled the z axis tower down. Andrew

[warpedmephisto]

How does it sound when you take that cut? For a 3/16" 2 flute end mill I usually take it at 0.05" DOC and 5 IPM at 4300 RPM. That usually produces a nice finish as well as doesn't load the machine too heavily. You might be working over the motor too hard and it could be tripping out because of the heat. I'm also betting you won't get much life out of your cutters running at that speed - too much rubbing and not enough cutting going on.

[redrider9112002]

It doesnt sound bad at all. No chatter.I think my rpm is 12,000, it changed with the new motor. The chips are more like thin strands then chips. I get about 400 inches of travel out of a 3/16 3flute with TAILN coating. When my motor cuts off, its to hot to touch. Also I can hear it cycle some of the power to it during my programs. Ive had my Tiag mill for a while, it came with the 1/8 hp motor. The 1/4 was much needed and I'm happy with the upgrade. If I hade to do anything softer like plastic or wax I'd probaly switch to the 1/8 motor. My average program is 27 min. with the 1/4motor and 45ish with the 1/8. I'm cutting through .5in. of 6061 in 3 passes at .167DOC and for my through holes because of counter sinking I've gone as deep as .3 at 2IPM. I do a little design in the face of the block at .1doc at 6IPM.Ive tried to go faster with bigger end mills(.25) and I pulled down the z axis tower. These seem to be the fastest the mill wants to run for my aplication. I'm very happy with the taig mill, it seems to be almost bullet proof. However I wish the 1/4 motor didnt over heat because I would like to try some steel parts, and the programs would be hours long. Andrew