Compression bit to Cut 18mm in on pass?

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1

Hi all, I found this bit on Amazon UK.

61FJd5x3ibL.SL1500
61FJd5x3ibL.SL15001500Ă—1500 67.8 KB

71afXOw0PkL.SL1500
71afXOw0PkL.SL15001500Ă—1500 179 KB

I am probably doing the maths all wrong, but can I really use this on a Maslow 4 @ 2286mm/min to cut 18mm OSB in one hit?

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2

It states depth of cut 1x cutting diameter, so i would say not.
i normally cut to half or 2/3rds of bit diameter as a rule of thumb

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3

I ordered some of these. wanted to give them a try, and at least in the US they are pretty cheap.

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4

That’s impressive, mdf would be different though (sorry for pun couldn’t help myself)

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5

Says for a cut depth 3 times the cutting diameter reduce feed rate by 50%.

so using the hardwood feed value of 180 inch/min, 50% is 90 inch/min, x 25.4 is 2286mm/min.

I guess what I need help with is, is the maths right, do the reductions in feed rate against increased depth claimed by the manufacturer seem legit, and can the Maslow 4 really go 2500mm/min?

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6

stuart powles wrote:

Says for a cut depth 3 times the cutting diameter reduce feed rate by 50%.

so using the hardwood feed value of 180 inch/min, 50% is 90 inch/min, x 25.4 is 2286mm/min.

I guess what I need help with is, is the maths right, do the reductions in feed rate against increased depth claimed by the manufacturer seem legit, and can the Maslow 4 really go 2500mm/min?

2500/min is probably on the high side of what the maslow 4 can do

but you probably aren’t cutting hardwood.

So it’s worth a try.

Remember that compression bits are not going to be removing the sawdust, they
will be trying to pack it into the cut (they are best used as a finish pass when
you aren’t cutting a slot so the sawdust has a place to go)

David Lang

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your right, that’ll teach me for just glancing and not reading through :flushed:
I’d be interested in how you get on with it if you do give it a try

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Will see if I am brave enough once the the frame is built and calibration done.

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9

So if not using a compression bit, is it normal to first pass with down cut, then swap to up cut for breaking through?

Will a Maslow 4 track the same path if the bit is changed part way through?

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10

stuart powles wrote:

So if not using a compression bit, is it normal to first pass with down cut,
then swap to up cut for breaking through?

“normal” is just to use a single bit for the entire job (typically an upcut
bit or straight bit to better clear the sawdust) and sand the edges after :slight_smile:

Will a Maslow 4 track the same path if the bit is changed part way through?

If you don’t power off the maslow electronics, it should give you the same
quality that you would get with multiple passes with the same bit. If you shut
off the electronics (and have to do the rehang dance) then it will depend on how
much error there is in determining the 0 length of the belts as they fully
retract. But it should be very close.

David Lang

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