Messages

Merlin
One more question.
Do you know a person who successfully thinned out a kitchen knife with a Tormek?
This would be a starting point, at least.
I'm using a series of flat diamond flat whetstones for that purpose and at the end the task of providing a nice finish is due.

And what are the facts? 

No, I meant, what are your facts? Is your single personal experience opinion supported by scientific data or by experince of multiple experienced users?
I hear what you are saying, and do not have any reason not to trust you.
I'm just asking for the many others, supporting your concern.

If you click at that link, it will tell you the time in your timezone.

That is my concern about the stone grader is I'm still not convinced it isn't doing just that, glazing the stone.

That is certainly a valid concern.
It should be seen in context with the real live experince of a significant number of SG-250 users.
Please be so kind to provide facts for the Tormek SG-250.

Here is a helpful topic https://forum.tormek.com/index.php/topic,3055.msg16402.html#msg16402

A dedicated sharpening service would never put up with such fandango, they would go and buy dedicated machinery for each task.

I know two sharpening services which use the multiple Jig Solution as described.
You used the word "never". A more open statement would possibly fit better.

Thanks for clarifying. We know now that this machine runs between 2000 and 3400 RPM.
Vadim Kraichuk did an fairly comprehensive testing on overheating of the knife apex. The report is available here http://knifegrinders.com.au/SET/Heat_in_Sharpening.pdf

Unfortunately, he did not directly address this type of leather disk wheel.
For general buffer wheel materials he concluded at page 19, that no overheating occurs, even with full speed.

Vadim most likely operated his machines in a 50 Hz environment.
So, his machines ran at 83% of the speed in an 60 Hz net.

Does anybody know facts about leather disc buffers?
Has anybody hands on experience with it?
I read in an ad that the leathers discs would not be glued together at the outer area and the air between the discs would support cooling. https://prosharpeningsupply.com/collections/wheels/products/leather-honing-wheel-fits-6-in-bench-grinders-and-polishers
The unglued space between the layers of leather allow for airflow and result in a much cooler running wheel, meaning you can make more passes in less time without overheating the blade.

I do not know if this is true.

Lots of assumptions about the speed of that leather disc wheel have been made here.
The RPM control at the machine seems to be set to a low RPM.
I could not find any information about the actual RPM in that video.
So, I do not know if it runs fast.

Here is the link to the full document.
The conclusion prefers half speed grinders over full speed.

http://knifegrinders.com.au/SET/Effect_of_felt_and_paper_wheel_on_edge_retention.pdf

I agree. See attachedYou cannot view this attachment.

I use Calcapp and I'm happy with it.

For easy cutting in a kitchen environment, a thin knive is much better than a wider knife. The width above the bevel is the key metric.
Speak to professional chefs or experienced hobby cooks.
They will confirm that the sharpness of the very apex of the edge will allow shaving hair from your arm, but not effortless cutting of raw carrots. It needs a thin geometry and a keen apex to achieve that.

The Tormek is a great tool for sharpening a variety of tools including knives. However, changing a knives geometry towards a thin knife with only 0,2 mm width above the bevel is not the area where a Tormek is best.

Except, notwithstanding the Tormek rating, the machine only draws about 100 watts in operation, so it would be $0.04 per hour.

Correct!
 

You pay money for Energy, measured in kWh. In my area 1 kWh cost approx. 40 cent.
If you run 200W Power for 1 hour,
the spent Energy is 200W x 1 hour = 200 Wh
200Wh equals 0,2 kWh.
The price for 1 hour would be in my case 0,2 kWh x 40 cent/kWh = 8 cent

Ken
Thanks. It would be off topic to go deeper into the technical background.
My comment was related to the presentation only.
If there would be constraints in using a T1 for certain stainless steels, it would be worth opening a separate topic.