multi-pass carving & conform

[Clyde Cochrane]

Appreciate all the tips. Have followed them all, bearings are good and cleaned, bit is good. Checked my cut motor hours, and now am over 250. Have ordered new brushes to replace them, but when I ran a test carve tonight, had the same y axis stall as the bit was going over a cliff. So I am wondering, could worn cut motor brushes cause variations in the cut motor speed when going deep and putting a load on the motor, causing a stall? Appreciate any insight into this.

[chief2007]

Appreciate all the tips. Have followed them all, bearings are good and cleaned, bit is good. Checked my cut motor hours, and now am over 250. Have ordered new brushes to replace them, but when I ran a test carve tonight, had the same y axis stall as the bit was going over a cliff. So I am wondering, could worn cut motor brushes cause variations in the cut motor speed when going deep and putting a load on the motor, causing a stall? Appreciate any insight into this.

You said you are over 250 hours, if you haven't done so you need to change the y motor bearings. This would be the most likely reason for your y axis stall.

Around 250 hour mark, the bearings wear out and need to be replaced. I just had y bearings go out at the 189 hr mark on a machine.

Replaced the bearings - no more y axis stall.

[Clyde Cochrane]

Is there a guide to changing the bearings? I have searched the forums, and have even tried to get the bearings out on an old Y-motor that failed on me, both to no avail. Not exactly sure how to get the bearings out so that I can replace them.

[chief2007]

Here is one link to a thread - search bearing replacement. Al aka digitalwoodshop has pictures posted - I will look for them and post the thread


http://forum.carvewright.com/showthr...ng+replacement

[chief2007]

Here is a thread with a picture http://forum.carvewright.com/showthr...ng+replacement

One bearing is removed from the back the other is removed from the front. You can use a small punch to help pop them out, usually the inside bearing comes out with the gear shaft.

Here is a link to buy beairngs if you don't have any - http://www.avidrc.com/product/1/bear...-bearings.html

[henry1]

CHIEF YOUR THE MAN i BOUGHT SOME BEARING FROM THEM WORK GOOD sorry for the caps and was looking were to buy them again

[dltccf]

You said you are over 250 hours, if you haven't done so you need to change the y motor bearings. This would be the most likely reason for your y axis stall.

Around 250 hour mark, the bearings wear out and need to be replaced. I just had y bearings go out at the 189 hr mark on a machine.

Replaced the bearings - no more y axis stall.

I am at 183 hours and periodically getting y axis stall. So I just ordered 4 from your link, at $1 each doesn't seem worth it to only order two.

[Clyde Cochrane]

OK, so I replaced the Y-bearings and I even replaced my flex shaft cable with another cable that I had purchased from LRH as a spare. Did a test carve (mpc attached) with no issues and thought I would try to run that carve that kep stalling out (mpc attached). Got the same stall in the same place as before (see pictures). The only thing that I haven't been able to replace is the cut motor brushes, because they are on backorder at LRH and I am waiting on them to be shipped. The only thing that I can think is that the brushes are worn down enough (over 250 hours) that when a heavy load is put on the bit that it stalls out, but I do not know enough about motors to know if this could be the case. Anyone have any ideas?1test.mpc94th Redraw Carve 1.mpc

[fwharris]

It is easy to check the brushes. Take the cover off the CW and you can remove the top brush cap to check the condition of the top brush. Use a fat tipped screw driver and be careful not to strip out the slot. I had one I had to cut a new slot with the dremle tool to get it removed.

Hard to tell but what bit are you using? 1/16 or 3/16?

[Clyde Cochrane]

Sorry it took so long to reply. Using a 1/16" bit, and replaced the motor brushes. They were worn down to less than half, which I believe was significantly reducing the efficiency of the cut motor. So I replaced them, and am running a cut now where I was getting Y-axis stalls on deep cuts. So far, so good, I have gotten past two of the previous stall locations. One other question, though. Got my hands on some of the CRC dry moly lube and lubed the flex shaft, expecting it to work well. However, am experiencing some significant heating around the point of maximum curve. I thought that this dry lube was supposed to be the best thing?