Need help chamfering holes in sst sheet

[Vretsam]

I am having troubles chamfering some SST sheet steel. I have tried a single flute, a 6 flute chatterless. and a mono chamfer tool, all with the same result of the chamfer not being in the center of the hole. It is in an open set up. I am doing these by hand in a bridgeport style machine. The head is tramed in perfectly. I am running a low rpm (100 rpm) and floating the position. It cuts to one side consistanly. The .800 hole is cut on the laser. I am not sure what is going on, and am getting frustrated by it not working right. The pieces that need chamfering are too large to fit in any of my cncs. What am I missing? Any thoughts and suggestions would be highly welcomed.

[POOR ENGLISH]

HAVE YOU TRY TO USE A HSS DRILL SHARPENED AT THE GOOD DEGRE (82 OR 90)

[roundman]

Sounds strange. Are you using a good collet to hold the chamfer tool with? It should go to center. I use molly dee on mine which seems to help cut. Use only good sharp chamfer tooling if they are dull they will give you problems. Is there any slack in your quill? Does something else work just fine? If not it could be something involving rigidity. Just some things I would check after cussing it real good.

[roundman]

It could be that the laser may have workhardened the hole. I am not that familiar if this would occur because of lack of experience with laser stuff but it likely would have apped a lot of heat to the material. You may check your chamfer tool for excessive wear at where the laser hole would line up and if you have wear there that could be it.

[GaryCorlew]

Laser cuts are very hard, even harder than plazma. I deal with lazer cuts a lot

[Ozcad]

I would use 6 flute cutter @200 rpm and use a fair amount of pressure on the quill I have found if you are to gentle sst will work harden,you need to be cutting not rubbing. the tool needs to be sharp and use some type of cutting paste /liquid
Hope this helps

[cinomarra]

try spotting it in reverse first

[Azor]

See if you can see the start point of the laser, where it burns through first ,then interpolates the hole dia, then finishes where it started. I'm guessing thats a hard spot and you're pushing away from it. Might have to fix a boss to your mill and set your plate on it rather than floating.