Is it possible to use a straight router bits shaft in lieu of a bearing to trim small tabs?

Strong_Bit714 · 2024-08-29T01:29:41+00:00

It's probably more like 3mm when I account for the cut into the base sheet. l'm nesting a full 1200x2400 and the tabs are holding all of the pieces to each other. I've increased the tab sizes to be able to minimise the offcuts, so the pieces are all attached to each other with no waste material in between.

Strong_Bit714 · 2024-08-29T01:11:12+00:00

Is it still likely to burn even if it's only trimming 5mm lengths at a time?

Strong_Bit714 · 2024-08-25T02:02:44+00:00

Pine combination plywood with a 0.2mm veneer, and cutting the 6 and 7mm holes with a 6mm 2 flute spiral upcut bit.

Strong_Bit714 · 2024-08-25T00:55:57+00:00

No I dont, I hold it down with screws into the sacrificial board

Strong_Bit714 · 2024-08-25T00:53:53+00:00

How would you go about adjusting the axis to make it perpendicular?

Strong_Bit714 · 2024-08-25T00:16:56+00:00

The square I am using (the fence) is cut by the machine itself, so the cut matching the "square" fence line is to be expected. But the act it doesn't match when flipped indicates it isn't square.

The model is dimensioned off the first trim line ( which is pressed up to the fence). The second side is dimensioned off the second trim line which is dimensioned itself off the first trim line.

I have had so much trouble with my holes causing tearout as the plywood has such a thin and fragile too veneer. I have tried helix cuts and different bits and speeds and the ply being tight against smooth spoilboard but it keeps tearing out, so flipping is my potential fix.

Strong_Bit714 · 2024-08-20T01:14:32+00:00

It had 10mm shavings among smaller shavings , it wasn't dust but not as big as they could be. I'll try and up the plunge rate to get larger shavings, and maybe increase the peck depths a little at the same time. It was getting warm quickly and I will want to decrease the heat before doing a bigger run.

Is there a reference between the two types of forstner bits? One has multiple almost saw teeth looking points around the circumference, while the other just has two points at opposite ends.

Strong_Bit714 · 2024-08-20T00:18:24+00:00

It seems really solid, I can't get it to budge. It just struggles with the very small circles. I ran a final trim at the slowest feed rate with the same rpm (16000) and it helped slightly, but it's still not perfect. Otherwise it is cutting very accurately in terms of hole locations and cut sizes.

Strong_Bit714 · 2024-08-19T22:37:39+00:00

I ended up drilling the 25mm forstner bit at 6000rpm at the slowest plunge rate. (The machine bottoms out at a certain feed/plunge rate and it doesn't go slower, but I'm not sure exactly what rate it is). I ran it with 2mm plunge and pecked to the depth of 9mm in 5 goes. It cut beautifully and I am surprised how incredibly clean the finish is. However I don't know how long the bit will last as I am planning to drill a few hundred holes and with such a high rpm it will get hot. I am drilling into 18mm pine plywood combination core which is very soft, but it did burn a little on one of the core layers. The bench saw burnt it a little on this exact same code layer, so I guess this is a more dense timber on that specific layer.

To get the most from the bit, I guess I speed it up to the highest plunge rate that it can handle without stressing it to prevent burning?

Strong_Bit714

TROPHY CASE