Coffee Grinder Project.....but I have some sharpening issues.

[Metal Grinder]

Hallo everyone...first post. :)

I am in the middle of restoring this old Danish coffee grinder from 1962, called Caravel de Luxe. Some parts are at the Paint Shop getting a fresh coat of candy apple red, and I am re-winding the 0,5 horsepower motor myself.
It is getting the big overhaul, but I am stuck with getting the burrs/knives re-grinded and re-sharpend.

It is a bit tricky because of the conical shaped burrs in front where the grinds come out. I tried to ask a few companies, but so far none of them had the tools or machines to do the work...or maybe they just didn't want to deal with this type of job?
I have been looking at quite a few videos about grinding and sharpening drill bits, and also OD + ID, so there must be companies somewhere who are able to do this type of work.
Or if there would be a private metalworker out there, who has the skill and tools, I would be very interested hearing from you.

I am living in Denmark, but have a friend from the States, who can help with the logistic part of it.

The whole project is also shown on this coffee forum, plus a few videos: https://www.home-barista.com/repairs/restoration-of-caravel-de-luxe-t47206.html

This first picture is the meassures of the three inner burrs, so you get an idea of the size.

370290

This is how the final edge have to look like. This is a set of normal looking conical espresso burrs.

370291

And the rest, is of the burrs of the Caravel grinder that I am restoring, and need to have the same looking Final Edge as the picture above.

370292 370294 370296370298 370300

370293 370295 370297 370299 370301

370302 370303 370304

[Metal Grinder]

I forgot the close-up of the inner and outer burr. Top picture: Inner burr. Bottom picture: Outer burr.

370305

[Michael G]

Welcome to our forum. The majority of us are here in Australia, so providing hands on help may be tricky but I guess we see how we go.

That looks like the sort of job that a specialist grinder could do but I suspect that they don't want to touch it because it would be very fiddly and so cost a lot.
I would suggest using a Dremel tool or a die grinder - although to get inside some of the parts an angled head may be necessary. The biggest issue is going to be making up a fixture that will allow you to get a consistent result. The two cylindrical parts should not be a problem as the motion required is a straight line (or very close to it) but the conical part will need a helical motion. Normally we would do that with a universal dividing head geared off a mill table. You need to find a hobbyist near by that cuts helical gears.

I hope that helps a bit.

Michael

[BobL]

Because coffee grinder burrs cost less that the time required to setup and sharpen, burrs are replaced rather than resharpened.
There are claims out there made by some folks that claim they can sharpen them by a polishing method but once a significant amount of the edge is worn off there is usually far too much metal that needs to be removed than can be done by polishing.
If anyone is likely to know if someone if has successfully reground burrs it will be folks on a coffee geek community?
You haven't stated this but my guess is you probably cannot buy replacements? but someone from an online coffee geek community might know of an old machine that has less wear and tear than yours that can be used as a parts machine.

[Metal Grinder]

Welcome to our forum. The majority of us are here in Australia, so providing hands on help may be tricky but I guess we see how we go.

That looks like the sort of job that a specialist grinder could do but I suspect that they don't want to touch it because it would be very fiddly and so cost a lot.
I would suggest using a Dremel tool or a die grinder - although to get inside some of the parts an angled head may be necessary. The biggest issue is going to be making up a fixture that will allow you to get a consistent result. The two cylindrical parts should not be a problem as the motion required is a straight line (or very close to it) but the conical part will need a helical motion. Normally we would do that with a universal dividing head geared off a mill table. You need to find a hobbyist near by that cuts helical gears.

I hope that helps a bit.

Michael

Thank you very much Michael...that helps alot.

Now I have a few more keywords to search with. Would you know a good Metal Forum with members from the US?