Chamfer Block

I was only thinking the other day it would be nice to be able to put identical chamfers on all corners of an object.

**LINK**

Sadly I don’t have either a surface grinder or a mag chuck but I may be able to come up with something for stuff I do have?!

You can do it with a countersink used as a milling cutter, by accurate measurement. I'be done it by CNC but should be possible on a manual mill especially if you have DROs.

I do it by eye, but it is very difficult to get them identical.

I spent a few weeks of my apprenticeship chamfering gear plates on a grinder that did just that!

the plates were offered up from above. Quite boring and too easy to chamfer the edge that didn't doing!

Jim

1/4" woodworking router and a bearing-guided bit. Sleeve bearing OD to adjust width; use router's height adjustment for depth.

I'm thinking a jig made out of a bit of angle iron with a slot cut in it, set across a grinding wheel so any metal slid along the vee gets ground down by the same amount.

Neil

Stefan Gotteswinter also felt the need and created this. **LINK**

Mike

Another method a little past half way of this video using a belt sander.

**LINK**

This is a (very small) modern version of the machine I worked all those years ago.

This one uses milling cutters, not a grind stone, but the principle is easy to see.

**LINK**

Jim

Edited By jimmy b on 26/08/2020 05:11:13

Put the block in the vice, place a good quality countersink in the collet, my rear vice jaw is always set Y zero as is right hand side vice stop X zero, set the depth of cut and lock it, set Y to give required cut when happy make note of reading say +3 then go round each face adding 3 to each block dimension + or - and you end up with four chamfers all same size, turn block over repeat you now have eight. It may sound long winded but when you have a lot of tooling to chamfer you want them to look the same otherwise it's a pigs ear, same can be done with rads.

Colin

That Assflag machine in Jims link looks interesting but I think one of their other machines is more inspirational. The type AF165 **LINK** .

Take one of the cheap "disk on a motor" sanding devices, like the LiDL £30 one I got on a whim, and get creative with an adjustable angle mount rather than the fixed pedestal and it could do a variety of other jobs. Especially if you have alternative tables / holders. Lathe tools being the obvious one as a poor boys Tiplap. Which was the plan for my LiDL device. Drill sharpening and touching up milling cutters ought to be easy enough with appropriate cutter carriers. Bound to be something that can be modified and repurposed in the back numbers!

Clive

Cool gadget and a godsend if you are a commercial machine shop churning out lots of work with lots of edges to chamfer. But for my (admittedly snail's pace) output, a 10" flat millsaw file will do all the chamfers I need, with job held in the vice to allow a nice chamfer filed on one edge at a time. It takes more time but I have plenty of that these days.

Yes, what's wrong with a file? As an apprentice toolmaker I was taught to file chamfers on tools, you soon learnt to make them identical or incur the Foreman's wrath or worse still if it was a part for one of the toolmakers. 60 yrs on I can still file chamfers probably quicker than it takes to set a machine up to do them.

The original idea came from Robin renzetti i believe i and he recently uploaded a video showing his latest design .

I personally like the way eccentric engineering did it on his acute sharpener video series( yes a plug for a long term advertiser on this forum) - a diamond lap or file . Gives very consistent results for small chamfers. Nice kit to build also !
None of these do reviews as far as i know so should be ok here .

Realistically a power driven unit is a gadget too far for most of us but if its something else a tool you need for other duties can do then ....

Clive

I have a pneumatic thing I now need to dig out and have a close look at!

At the last place i worked at we had a pneumatic air grinder with a pair of adjustable blocks and you just run it round the block after adjusting the champher width with a thumb screw. There was a 2 inch grinding wheel on end of spindle behind the two Vee blocks. I believe you can get one with a cutter instead of grinding wheel but it made a lot of needle shaped swarf and can only cut soft steel.

David

I agree with Dusty, can't you lot use a file.

I have put chamfers on in the mill but only because the block was in the mill at the time. The only other time was deep chamfers on the slots of the table of my tapping and staking tool.

Oh and chamfers on trespar for tool stands which gets the router treatment.

regards Martin

;O)