You should expect a burr. The problem is resolved by the use of a small file.

Most drawings in engineering usually carry a comment like "remove all sharp edges". This should be done as a matter of course if only for your own safety. One thing that is not stated is how enthusiastic you should be with the file.

JA

Edited By JA on 25/11/2016 23:20:19

Burrs are very easy to remove, fine file will do the job. Looks like your mill is "off tram". can tell by the finish on the workpiece. Some people like it slightly "off " to prevent the cross hatching that a perfectly trammed mill produces.

I prefer it to be "on tram " It is not so important on a small area workpiece, but the bigger the area the more "off " it will be. Just thought I'd mention that.

cheers

Neil

What differences are there in the 4 deburrer blades ? I've had one deburring tool for years and use it on all materials for internal edge cleaning, I don't recall ever using it on an external edge, normally a small file for those jobs.

Emgee

+1 for deburring tools. Files tend to leave a hatched finish and knives are not very safe when used for deburring. I think mine is a Noga brand bought in Canada but there are a variety to choose from and the Arc ones look like good value.

The Shaviv ones we gave away as a reader offer are very good as well.

Neil

I too use those deburring tools. I have the Shaviv aluminum handle which look good and fits nicely in the hand. One word of warning: although they are easy to use, don't get too complacent. If you slip they can put a nasty gash in an otherwise nicely finished surface – ask me how I know. (They are fine if you keep your mind on it. Just don't use them in distracted-mode).

Another really kewl deburring tewl is this. I have several of these and use them a lot.

You can reduce the burrs being created by using a smaller cutter and have it with the cutting forces into the work piece edge. ie, a piece that is 20mm wide and 100 mm long, could be faced with a 25mm diameter cutter, but the larger cutter will most times leave a burr. If you use a 12mm cutter and approach with 2 axis till the cutter is just past the 1/2 way part of the work piece, ie 10.5 mm from 1 edge, it will cut clean mostly with little to no burr at all. In industry there are many times where a clean sharp edge is a requirement of the part being made.

Neil

Sadly i don't think any technique can remove the burring that inevitably follows the cutting action, I stress that it may be managed, to a degree that it becomes insignificant,i.e using sharp tools. What insignificant is though is entirely down to the user, generally speaking, industries accept an .05 rad toleranced for deburring on most applications. 

but so far nobody has managed to come up with a method for totally eliminating burrs in a single cutting action, you just have to accept that this happens and you need to try and mitigate it with whatever you've got.

Burrs cost industry millions per year, the conundrum has never been solved. Thus huge amounts of money are both spent and generated in the art of finishing operations. 

Michael W

Edited By Michael Walters on 28/11/2016 11:50:31