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35mm drilling speeds?

8/12/14       
Pdub

I did a search and couldn't really find a straight answer.
We're about to put 35mm and a 8mm bits into the drill block of our new machine to drill hinges for slab doors. It seems I need to slow down at least the 35mm bit. Do I need to slow RPM (if I even can on my machine)? Feed rate? I also assume it's different for different materials. We will be doing veneer/ MDF, melamine and also laminate. I assume the laminate would be slower to get through the lami-layer?
Thanks

8/12/14       #2: 35mm drilling speeds? ...
Bill

Yes different speeds for different machines. I would go with what the drill manufacturer recommends as a starting point. We are able to vary both RPM and feed with our machine no problem.

8/12/14       #3: 35mm drilling speeds? ...
Phil B

most drill blocks wont have enough pressure to consistently drill the 35mm cup depth accurately enough. Route it out.

8/12/14       #4: 35mm drilling speeds? ...
cabinetmaker

I agree- it will most likely hit the vertical grade or line and score it until it produces blow by. Do yourself a huge favor and save the $ and route it out

8/13/14       #5: 35mm drilling speeds? ...
Mike McClaran

Website: http://www.greenbvc.com

Sometimes it helps to give us the name and model of your CNC machine.

Typically speaking, 8mm bits will drill at 3 meters per minute. When you increase the diameter to 35mm the vertical feed rate should be cut in half. Lots of variables though. Depth, wood type, rpm to name a few. Most likely your drill head is spinning somewhere around 3000 RPM. I have never heard of a variable speed drill head.Most router motors are variable speed these days. It's much faster to use the drill head because it's already spinning to do the 8mm holes. If you really want to do this 3 times faster then you can purchase a Benz hinge aggregate for your router motor. And yes, I would go slower than 1.5 MPM on the laminate. A feed rate of 1.0 MPM would probably get the job done.

8/13/14       #6: 35mm drilling speeds? ...
Larry Schweitzer

Watch out for the laminate when using spur bits. Sometimes the adhesive won't hold the disc of laminate that is cut free and the machine will spin it until it is really hot.

We drill the 35mm cup holes. Our drill box is fixed speed.

8/13/14       #7: 35mm drilling speeds? ...
cabinetmaker

I got so tired of the time wasted on the drill block and scoring that I just cut out the cups with the 1/4" down cut

8/13/14       #8: 35mm drilling speeds? ...
Phil B

Biesse offers a variable speed drill block. However we still route hinge cups. Variable speed is quite useful for different materials and diameters (just prefer to route 35mm).

8/14/14       #9: 35mm drilling speeds? ...
Pdub

Sounds like it's pretty split. We have a fixed speed drill in our SCM Pratix. We route them now and it seems to work fine. Maybe we will just stick to that.
Thanks all.

8/14/14       #10: 35mm drilling speeds? ...
cabinetmaker

When we set up our cnc, we used melamine, and the 35mm drilled great. Only thing is we don't use melamine for the doors, we use balanced panels. So trying to drill p-lam with a 35mm ended up with us having to not only wait on this, but then we had to take them to the hinge machine. So that is why we ended up just routing them.

8/14/14       #11: 35mm drilling speeds? ...
Larry Schweitzer

A way to avoid the springyness? (is that a word??) of the air cylinders on the drill box is to do a tool change and drill with the main spindle. Might be worth it if there are a lot of doors on the sheet.

8/16/14       #12: 35mm drilling speeds? ...
Jim Kolar

We drill our 35mm & 20mm with main spindle.

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