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Deburring for a Toothy Ed...
Forum: All About Edges
Last Post: grepper
10 hours ago
» Replies: 1
» Views: 12
Throwing Axe Handles
Forum: Relevant General Discussion
Last Post: MaxtheKnife
02-26-2021, 06:02 PM
» Replies: 2
» Views: 27
Old sharpening methods...
Forum: All About Edges
Last Post: Rupert Lucius
02-21-2021, 12:05 PM
» Replies: 83
» Views: 53,668
My Sharpening and knife r...
Forum: Relevant General Discussion
Last Post: MaxtheKnife
02-21-2021, 08:25 AM
» Replies: 69
» Views: 19,587
Why shaving razors dull
Forum: All About Edges
Last Post: blgentry
02-13-2021, 07:28 AM
» Replies: 7
» Views: 219
Phone applets for sharpen...
Forum: Product Showcase
Last Post: KnifeGrinders
01-28-2021, 11:18 AM
» Replies: 0
» Views: 70
Knife Grinders and AKM Pr...
Forum: Edge Sharpness Testing
Last Post: Mike Brubacher
01-22-2021, 10:09 AM
» Replies: 0
» Views: 76
polished edge vs toothy e...
Forum: All About Edges
Last Post: Mike Brubacher
01-15-2021, 01:54 PM
» Replies: 1
» Views: 128
PT50 Case?
Forum: BESS
Last Post: grepper
12-28-2020, 06:07 PM
» Replies: 1
» Views: 151
Merry Christmas to everyo...
Forum: Relevant General Discussion
Last Post: KnifeGrinders
12-27-2020, 01:03 PM
» Replies: 2
» Views: 201

 
  Deburring for a Toothy Edge
Posted by: danforth - Yesterday, 09:39 PM - Forum: All About Edges - Replies (1)

For you belt guys, I'm looking for recommendations on my final stropping/deburring.

Here is my typical progression:
1. Cubitrion II 120 grit
2. Trizact A30
3. Leather belt (smooth side) with green buffing compound

It gives a very sharp edge, but I find even with feather pressure, the green compound, while it assists it removing the burr quickly, polishes the apex of the edge. I'd like to preserve the tooth as much as possible.

I'm looking for input and discussion on options for step 3 above (or possibly adding a fourth step). Here are some I've thought about

Changing a step:
3. Use a leather belt (or other belt) loaded with CBN or diamond compound to maintain the tooth and assist in deburring without polishing action. Any suggestions on brands or micron size?
3. Use a finer or coarser buffing bar to control the rate of polishing action. Any recommendations on types? I think I am going to abandon the honing compound, personally. At least as far as tooth preservation is concerned.
3. Use a different speed SFPM for the final step so the polishing action is not occurring as rapidly. Could this reduce the effectiveness of the burr removal?

Adding a step:
+ 4. additional trailing pass on each side using a medium ceramic rod or ultra fine diamond rod. This works very well to restore tooth to the polished part of the edge. But really it is just undoing what has been done.
3/4. use scotch brite to deburr followed by plain or coarse side leather. I take it this is the approach many are using right now, and perhaps it is also the best. No compound and just use a two-belt deburr process.

I'd love to hear from those using CBN or diamond compounds for deburring and also those using scotch brite or felt belts do deburr. The SB I find gives fairly rapid burr removal. Felt I find has not produced quick or consistent removal.

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  Throwing Axe Handles
Posted by: MaxtheKnife - 02-24-2021, 07:40 AM - Forum: Relevant General Discussion - Replies (2)

hello everyone

today i have a question and i need opinions and suggestions or advice.

one of my newest knife exchange customers is a big sports complex, i supply the kitchen knives on a bi-weekly exchange and they also have 4 axe throwing bays (booths) and i have a 10 axe bi-weekly exchange also.

the problem is they charge like 24.00 per hours per person to throw my Cold Steel Competition throwing axe at a wooden target and 99% of these people have no clue on how to throw and axe (nor do i)..............this leads to many many broken wooden axe handles.  they are open from wed thru sunday and every wed i call in the morning to see how many were broken.  so in 5 days of throwing 10 axes, they break from 4 to 8 per 5 day period.

i have been using Cold Steel replacement handles (hickory from asia) and i bought some nice Tenn. hickory handles to see if they would last any better..........NO.

they decided to try a fiberglass handled axe from Kobalt to see how they hold up.  they did hold up, but they would fly all the way back at times to the person throwing...........down the river with that plan.

i have sharpened many throwing axes for other customers before this exchange came along and most used same type of wooden handled axe or many used the Estwing steel campers axe..............a bit pricy compared to the Cold Steel wooden...............not sure on the bounce back part.................but at the cost of the handle and removing and replacing the broken wooden one every 5 days has become expensive for us both.

let me know your thoughts on all of the above..............thanks



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  Why shaving razors dull
Posted by: KnifeGrinders - 01-31-2021, 02:51 PM - Forum: All About Edges - Replies (7)

The most comprehensive discussion I've ever read about the shaving razors - post https://bladeforums.com/threads/is-micro...s.1769466/

I've learnt that of the multiple factors dulling the razor, the main is water salts deposited when it dries.
Now after use I blow the water out of my cartridge razor with my wife's hair dryer.

I've also finally learnt the shaving razor composition and hardness:
12-13 % Cr and 0.6 % C, heat treated to around 62-3 HRC

I was impressed by how 1 short comment by Todd Simpson invalidated that complex scanning electron microscopy experiment on cutting the hair that chipped the razor.

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  Phone applets for sharpening knives on budget wet grinders
Posted by: KnifeGrinders - 01-28-2021, 11:18 AM - Forum: Product Showcase - No Replies

We've developed iPhone and Android applets for sharpening knives on popular slow wet grinders.
Some of these budget grinders have advanced features absent in Tormek.

WEN BG4270 - reversible rotation
Thanks to the reversible rotational direction of the WEN, you can use our software for both the grinding and honing wheels, and get an exceptional sharpness on your knives.

video https://youtu.be/00JYFMimU18

Holzmann NTS 250PRO - variable speed
This machine attracts by variable speed. Actual grinding wheel speed is 90-160 RPM

video https://youtu.be/9axTxxa5-iE

Scheppach, all models

video https://youtu.be/ae6nRAWKuRU

Record WG250 & WG200

video https://youtu.be/e8m1VaO75Ts

Jet JSSG-10

Details on our website http://knifegrinders.com.au/11Shop.htm

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  Knife Grinders and AKM Propose New Study
Posted by: Mike Brubacher - 01-22-2021, 10:09 AM - Forum: Edge Sharpness Testing - No Replies

Knife Grinders and Australian Knife Magazine, in conjunction with CATRA, are proposing a new and comprehensive study  of the cutting attributes of various knives.  The following is a link to the Australian Blades Forum where additional information may be found.

https://www.australianbladeforums.info/f...ine/47288-

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  polished edge vs toothy edge
Posted by: BillMoody1 - 01-14-2021, 02:43 PM - Forum: All About Edges - Replies (1)

Brian Gentry just put up a new youtube video on polished edges vs toothy edges. 
Thought I'd just drop a line to make you aware of it; sure has been quiet around here
lately. Where's everybody? Smile

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  PT50 Case?
Posted by: CasePeanut - 12-28-2020, 01:21 AM - Forum: BESS - Replies (1)

I keep my PT50B in a drawer in my garage/knife shop. I’ve kept it pretty clean so far, but was thinking about some kind of padded case to really keep the micarta and steel dust out. How do you store your PT50?

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  Merry Christmas to everyone
Posted by: MaxtheKnife - 12-25-2020, 08:03 AM - Forum: Relevant General Discussion - Replies (2)

see you all soon

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  1/2HP Kally
Posted by: SHARPCO - 11-21-2020, 04:38 AM - Forum: Relevant General Discussion - No Replies

https://www.kalamazooind.com/product/1sm...lt-sander/

You can order 1/2HP 1725RPM Kally or 1/2HP 3450RPM.

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  Precision Sharpness Testing Device
Posted by: Willy - 11-01-2020, 09:03 AM - Forum: Edge Sharpness Testing - Replies (11)

Hi all,

I read a lot here in the forum and noticed that there can be some problems with the measurements if the user makes mistakes unconsciously. That is why I built a device that should deliver absolutely reproducible results (sorry, german language only, but I'm sure you will understand the function):





I used the BESS line and various fishing lines with the device. The lines are:
CE = Carbon Carp Expert 0.25 mm, measured 0.29 mm
TC = Tectan FCC (Fluorocarbon coated) 0.25 mm
TF = Tectan Fluorocarbon 0.25 mm
PF = Perca Forellen-Schnur Spezial Coating 0.25 mm
CF = Cormoran Profiline Forelle 0.25 mm
Unless otherwise stated, the thread tension is 100 cN for BESS and 300 cN for the other lines (1 cN ~ 1 g).

The first series of measurements was disillusioning. I expected better reproducibility:

   

Now other fishing lines were compared with the BESS thread:

   

The BESS values show the greatest spread. Scattering? No, always an increase. I noticed this during the measurements (i.e. without a diagram) and before the last 3 measured values, the blade was wiped with dry kitchen paper. The following value was significantly lower. The last two values show the typical increase again. Hypothesis: the BESS thread leaves tiny deposits on the cutting edge that cannot be seen with a magnifying glass. Another thesis: these deposits were removed by the CE thread (decrease in the required cutting force).

Now the cutting edge was cleaned with dry kitchen paper after each cut:

   

Up to the tenth cut, the cutting force decreased and the values are below those in the last figure. After that there is no further improvement, but the reproducibility is finally as good as I expected.

The knife position remains unchanged. In order to see whether all threads require a higher cutting force with increasing number of cuts, 10 cuts were carried out without intermediate cleaning. This was followed by thorough cleaning of the cutting edge with dry kitchen paper. The findings:

   

The Tectan Fluorocarbon line works best, which according to the packaging consists of 100% PVDF (polyvinylidene fluoride). The BESS thread shows the greatest increase and the greatest spread. Originally I had the secret assumption that the BESS thread was just a fishing line. Now a special coating seems likely to me. In addition, the fishing lines only require about 30 cN cutting force with a razor blade, while the BESS line requires the expected 50 cN.

Now the cutting edge has been cleaned after each cut. The following diagram shows that a defined thread pre-tension must be applied for reproducible values:

   

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