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Router bits 1/8" vs 1/4"

What 1/8" bits do you use?
Do you use a 1/4" to 1/8" collet adapter?
I’m using a 1/4" to 1/8" adapter and with only 1 cm of the bit chucked, it doesn’t stay in very long even with it cranked. The plunge adapter on top of the sled does not allow a deep enough plunge to get the collet at the surface of the wood (through the sled opening), so I’m either going to need longer bits or a better z axis setup. I was cutting 3/8" ply and the bit was too short to cut all the way on part of it.

What are typical cut depths and speeds folks are running with 1/8" bits?

Is it a dumb idea to use a dremel bit (they are much longer similar to the 1/4" ones) or am I forced to go the the meticulous Z to get the height clearance? curious what the consensus is.

The standard operation here that works is a down-cut at 4 mm depth and 550 mm/min.
The 1/8" was an up cut running at 5 mm depth and 550 mm/min using amazon carbide upcut bits.

Thanks

I just ran a 3/4" cut this week with a 1/4 to 1/8 adapter, well actually just drilled holes with the 1/8 bit. I haven’t run that deep of a cut with a 1/8" bit because it would take a very long time, and I am for now, still using the router body for the Z-axis and the machine is slow anyway. I generally don’t cut deeper than just a little more than half the diameter of the bit I am using,

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if you use longer 1/8" bits then they tend to break, so best to fix your z axis issues, IMHO
If you are using a 1/2 to 1/4 collet adapter and another 1/4 to 1/8" collet adapter, that might be too much play. Best to use a 1/2 to 1/8 adapter, from china if that is the case.

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I actually think the adapter I was talking about is my 1/2" one, I have several for different sizes of bits. It was late late night when I posted that. The rest still applies.