Thread: Getting tear-out - need advice
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03-01-2018 #1
Hello,
Just jumping in on this - I am at the exact same stage, I am using the end mill bit that came with the 3040 router I just got and am driving it around some soft pine at the moment.
It's all going OK but like you I am experimenting with feed rates etc.
I am getting very rough top edges in as much as it is not a nice clean cut - the internal walls of the cuts are really smooth but it leaves a burr most of the way around the top.
I have learnt that there are bits for down cutting and up cutting. I have no idea what I am using, I suspect I will just need to go and get a decent end mill cutter for wood. I am thinking that a 'down cutter' will work best for me in terns of having the clean top edge.
Does any of this sound familiar?
Kind regards
Richard
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03-01-2018 #2
You could use a ramped profile with very shallow DOC to mark the slot to around 2mm depth prior to cutting it, a bit like using a marking knife in conventional woodwork to prevent torn surface edges on saw cuts.
Last edited by magicniner; 03-01-2018 at 02:22 PM.
You think that's too expensive? You're not a Model Engineer are you? :D
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03-01-2018 #3
That does make sense though the software that I am currently using to generate gCode does not support that.
I will look in to CNCUSB as that allows some creation of code independently.
Here is a picture of the kind of thing I am experiencing:
I suspect that if I 'face off' the entire piece after this work then the problem will be removed but I am just wondering, should it be like this? Is it the wood? Is it the tool? Is it the feed rate or speed?
Kind regards
Richard
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03-01-2018 #4
A downcut spiral is what you want to use.
Gerry
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03-01-2018 #5
Sometimes if I want a small chamfer around the pocket I do an engrave cut first with a V tool, this leaves a nice edge but I only use hardwood and that always leaves a better edge than pine anyway.
A straight flute cutter would be better than the one you use at the moment or as suggested a down spiral generally works best.
These cutters give me good results at great prices; https://www.toolstation.com/shop/Pow...er+Bits/sd2579Spelling mistakes are not intentional, I only seem to see them some time after I've posted
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03-01-2018 #6
Thank you for that - I shall head over there now.
I am only playing on the soft wood at present but I will take a look at the down spiral bit to see how that improves things.
Kind regards
Richard
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03-01-2018 #7
I am currently looking at part no. RDM62760 from here: https://routercutter.co.uk/rdm62760
Given that I am looking for a spiral end mill down cutter with 6mm shank, it looks like that is the thing.
Am I close?
Kind regards
Richard
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03-01-2018 #8
Hello and thank you for that - I have been looking around at tools trying to find a downcut one - so far I have only found down+up cot ones which I don't think is what I want.
Might you be able to point me in a suitable direction - perhaps to a recommended supplier?
Kind regards
Richard
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