Dust Shoe Attempt

[FWMiller]

I've been wanting to try to build the dust shoe project posted by Bergerud for a while now and finally got to it. I thought I was doing pretty good on the first part. The front and back were nicely aligned. The Carve was in the home stretch when the machine went a bit kooky and snapped off my 1/8 cutting bit. The bit is new so it is (was) still sharp. It only had about 45 minutes on a poplar project plus cutting out the sleds for the dust shoe. Any ideas on what went wrong? Not a big deal ruining a couple pieces of acrylic but 90 minutes on a $40 bit is pretty painful. I'm hesitant to try again unless I can find some cheaper 1/8 cutting bits to put in my ER11 chuck which is sitting and waiting to be tried out for the first time.

Frederick

[bergerud]

Did you see what happened? Did the bit slip out of the chuck? I do not think the project is responsible. It is some easy cutting. Go and buy an upcut, two flute, router bit like the one in the picture. It will cost about $20 but you need not fear it breaking.

[FWMiller]

Unfortunately I did not see it happen. It's definitely not the project. It looks to me like a machine malfunction. I walked into the house to do something and heard the motor start spinning without load. I came back to find that the bit had veered off the acrylic work piece and into the sled. The bit broke when it veered back and hit the edge of the acrylic and I guess got bound. I'm not using my ER11 chuck yet so no, the bit did not come loose. I was using a carvewright bit with the carvetight pressed adaptor and it was solidly in the spindle. Something caused the path to veer off course and off the workpiece and I'm not sure where to look. I had to do my sled over a couple times because the drill holes on the left side were misplaced in the x-direction. So it looked like I had some slippage in the x-direction. When I remembered to add the tape the problem went away, so I thought that was probably the problem. The failure this time is that it drifted too far in the y-direction which took it off the work piece.

I have noticed that the x drive motor sometimes seems to labor when starting up for a board measurement. It only seems to do it when moving left. It ramps up slowly from stop but when it reverses direction and moves to the right it moves quickly and gets to full speed right away. Is this normal operation? It doesn't sound quite right. I've checked to make sure the board is not binding and slides freely against the stops. I've also got tape on the bottom of the board for the brass roller as I see often recommended. The is an A version machine. I've got less than 100 hours on it but based on previous experience and what I've read I'm unfortunately worried it's going to break every time I use it.

By the way, where did you get your 1/8 upcut router bits? I'm having a tough time finding one with the cutting length more than half an inch for a price much less than the original carvewright. Plenty of them with only 1/2 inch cut length. I also searched for end mills and had similar results.

[henry1]

Here the sample just made of the Y gear box

[bergerud]

I guess the x is another problem. The y should have lined up. Dust in the y encoder? I am at a loss.

[bergerud]

You could tweak the hole smaller on the mpc when you carve another one. Run out of the CT can make the hole bigger. Measure the hole you got with a caliper and make the hole that much smaller.

[henry1]

thank you for the info will do

[henry1]

You could tweak the hole smaller on the mpc when you carve another one. Run out of the CT can make the hole bigger. Measure the hole you got with a caliper and make the hole that much smaller.

this one I believe turn out great , now will do the acrylic one all should be good now what you think bergerud

[NLAlston]

Did you see what happened? Did the bit slip out of the chuck? I do not think the project is responsible. It is some easy cutting. Go and buy an upcut, two flute, router bit like the one in the picture. It will cost about $20 but you need not fear it breaking.

I had wondered about cheaper alternatives. Good to know this.

[bergerud]

The router bit I was describing does have only 1/2" of cut and is in most router bit racks. This is good if that is all you need. It will not break. Since you have the er11 adapter, you can also use bits like :

http://www.dhgate.com/product/3-175-...nt_left-1-null

Why your y went off course like that is strange. Could just be a firmware problem formatting the card would fix. Hard to say. The funny, labor like noise that the x drive makes is a feed back problem to do with the x drive trying to agree with the brass roller data. I was told by someone at LHR that backlash in the x drive gears is the cause and it was normal. It bothers me sometimes too.