Cutting out holes?

[jaustin]

Got a pattern need to cut the holes to the correct sizes.
Either I go to big or too small.
How do i figure out what size i need to cut out to get the correct size with out multiple trys?

82396

[fwharris]

Use the drill tool instead of a carve region. The carve region will leave a tapered hole.

[bergerud]

You should also use the snap grid.

[jaustin]

Thanks for the suggestions.

Ill try to redo it and rerun it this weekend.

[Digitalwoodshop]

I made this sample hole board that took the guess work out of slots.... You could do a hole version....

It changes with humidity but it is quick.

Al

[ronboley]

I used the carve region for the slots to hold the drawer pulls in the "treasure box" band saw box project. It does leave a tapered hole that in my case was great to seat the flat drawer pulls in the slot. Just sanded the pull end to the taper and they seated in the slot.

[jaustin]

I made this sample hole board that took the guess work out of slots.... You could do a hole version....

It changes with humidity but it is quick.

Al


Al Thanks
I will do a layout. What increments did you do betwen each square?

[bergerud]

Drilling holes with the drill function and the 1/8" cutting bit produces very precise holes. There is no need to experiment with hole sizes.

It is not like carving holes and cavities with a carving bit. The carving bit is tapered and has a ball end, and so, trying to make precise holes with straight sides is impossible.

[DickB]

For my clocks, the drill function is not always precise enough. I use brass tubing press fit into holes drilled into wheels and pinions - the fit must be exact. The drill function is not precise enough for this. I even tested several increments of diameters slightly larger and smaller than the target, but found the result was not repeatable. For these very precise holes I have the machine drill a 1/16" pilot hole and follow up with a drill press. (One can use the 1/16" carving bit for the pilot holes as they are drilled only .1" deep.)

[bergerud]

That must be from runout Dick. Are the holes always bigger? I am always impressed by how accurately my machine cuts holes. To the thousandth whenever I measure.

[Digitalwoodshop]

John,

.1 I believe.

[DickB]

That must be from runout Dick. Are the holes always bigger? I am always impressed by how accurately my machine cuts holes. To the thousandth whenever I measure.Yes, probably runout. But if I put the 1/8" cutting bit in my drill press and drill a hole, a 1/8" brass tube slides in and out. If I use a 1/8" drill bit, it is a tight press fit. The difference may be only thousandths, but it is enough. Try it yourself - insert the shaft end of a drill bit into an equal diameter hole machined by your Carvewright. Ideally it would be a tight fit.

[bergerud]

Yes, probably runout. But if I put the 1/8" cutting bit in my drill press and drill a hole, a 1/8" brass tube slides in and out. If I use a 1/8" drill bit, it is a tight press fit. The difference may be only thousandths, but it is enough. Try it yourself - insert the shaft end of a drill bit into an equal diameter hole machined by your Carvewright. Ideally it would be a tight fit.

Tried what you suggested and the cutting it did make a slightly bigger hole than the drill bit. Then I tried the cutting bit by pulling it in and out many times to clear the chips. The hole was smaller. It may just be that the drill bit clears the chips better than the cutting bit. The cutting bit seems to plug up and "ream" the hole bigger. Interesting. I will have to experiment some more with other materials and the CW instead of the drill press.

[jaustin]

Thanks all I switched to the 1/8 bit and it is a lot better.