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How bad is that bit

7/15/18       
Gerry Member

I bought a USB microscope and have been using it to check my router bits. I find it very useful for this purpose. We do a lot of odd jobs and change bit out quite often so have bits in the shelf that might just be dirty or are very dull. The scope takes the guess work out of the process for us. This is the one we have. https://www.amazon.ca/gp/product/B00CMJ1I08/ref=oh_aui_detailpage_o00_s00?ie=UTF8&
amp;psc=1

It allows you to take photos and measure.


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7/16/18       #2: How bad is that bit ...
Bill

I have never looked at a bit in that way so it is hard to say. I see a chip, that’s a problem I also see a ragged looking edge. If I was to approach it this way I would look at new, look at dull and compare the two. Then I would run test cuts and look at the edge finish, listen to the bit and make a judgement. We run a standard set of cutters and finish, sound and sheet count cause us to swap them out.

7/16/18       #3: How bad is that bit ...
Gerry Member

Bill,
I am in the same boat in terms of not knowing what they should look like. We have always listened to them cut and used a small magnifier to look at them. I have attached 3 more images the first is a new never used cutter the last 2 are of a compression cutter fresh back after sharpening. It is easy to see why the sharpened cutter does not last as long!


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7/16/18       #4: How bad is that bit ...
rich c.

I can do the same thing by running the cutting edge over my fingernail.

7/16/18       #5: How bad is that bit ...
Gerry Member

Rich I just tried that on the up-cut portion of the sharpened bit in the last pictures and could not feel any of the toothy edge shown in the photo.

YMMV

7/16/18       #6: How bad is that bit ...
shawn

Website: http://Activetooling.com

the sharpened bit does not look like it was sharpened proper they have to be faced, o.d. and ended for a proper sharpening

7/16/18       #7: How bad is that bit ...
Gerry Member

Shawn, I am not familiar with the term ended? Can you explain?

Thanks

7/17/18       #8: How bad is that bit ...
Chuck Hicks Member

Website: http://www.southeasttool.com

Gerry,

I would say the the bit with the 2 chips is from where the glue/laminate was. The magnification is a good tool to use. We go up to 1500 on our bits.

7/17/18       #9: How bad is that bit ...
Bill

We use vortex bits and send them to vortex to be sharpened. Sharpened bits last as long as new.

7/17/18       #10: How bad is that bit ...
Gerry Member

Chuck, I don't know what happened to that bit, I have seen staples in the edges of some of our melamine so it could have been that too. I am a little surprised to see so much chipping on the bits I have looked at. I am sure at 1500 all of the edges look toothy.

Bill, I have used Vortex but I am in Canada so the shipping can add up and sometimes I have them done locally.

I will be viewing the bits in stages as they are used and think this scope will give me a better idea of what is going on with my cutters. I do use it for viewing finish problems and other uses so I think it was a worthwhile purchase.

7/17/18       #11: How bad is that bit ...
Chuck Hicks Member

Website: http://www.southeasttool.com

Gerry,

What size parts are you cutting and what are your feeds and speeds?
We have different carbide grades and coatings available to help

Staples? Ouch ! !


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7/17/18       #12: How bad is that bit ...
Gerry Member

Chuck, We are cutting a lot of 2 sided melamine mostly but some pre-finished ply and veneers on PB. We do use quite a bit of baltic birch also for some projects. The .5" compression we are at 16,000 rpm and 600 ipm. We cut mostly cabinet parts but sometimes drawer parts that are much smaller so never really reach the feed rate. We were running 18,000 rpm and 700 ipm but found we were getting too much heat.

7/17/18       #13: How bad is that bit ...
Chuck Hicks Member

Website: http://www.southeasttool.com

Gerry,

Sounds like you have a bunch ot figured out already. With that Feed and Speed, that is a .019 chip load, If you can hold the parts you could increase that but it seems you have already got that one handled also.

Safe Routing

8/21/18       #14: How bad is that bit ...
Matt

Staples are an obscene stupidity and we encounter them all the time here, in plywood, melamine, and lumber.

It's 2018, and manufacturers use cutters that cost $80+ each, and these mills still haven't stopped using metal staples despite the fact that everyone upstream from them thinks they are assholes for using them lol.

Either way, agreed with the above, I would definitely make some test passes just to see.


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