Meanwhile in Russia
Hi everyone!
Last week I had an awesome opportunity to visit Shirogorov Brothers Workshop, during the talks about knives, production and knife industry development we came up with an idea to test bearings system used in Shirogorov knives in order to determine clear the advantages of specific bearing systems. Im glad that I can share the results with the community now.
We selected Flipper 95 as a most popular model and the following bearing system were tested:
- Single-row ball bearing system - SRBBS (Serial Division F95), 17 balls on each side between blade and Ti scales.
- Single-row roller bearing system SRRBS (Custom Division F95), 17 rollers on each side between blade and Ti scales, without hardened steel washers in Ti plates.
- Double-row roller bearing system - DRRBS (Sergey Shirogorov Custom F95), 27 rollers on each side between blade and Ti scales, with hardened steel washers in Ti plates.
The testing was rather simple and pragmatical we applied a vertical load* directly to the pivot point of the knife resting on two wooden bars so that the pivot had no support. Load was applied progressively to the certain magnitude, then knife was checked for damages sustained, residual deformations to the parts, changes in the mechanics of the locking and flip.
*all the figures are given both in kilos and lbs.
1. Single-row ball bearing system - SRBBS
- 30 kg / 66 lbs no changes to the mechanics, no deformations;
- 50 kg / 110 lbs - no changes to the mechanics, blade is centered, no blade play, no visual defects. After the knife was taken apart tiny deformation on the titanium plate made by steel ball of the bearings observed (see on the pic. in black);
- 70 kg / 154 lbs notable changes in the mechanics when deploying the blade slowly without applying the flip, still no blade play, stronger deformations on the titanium plate observed (see on the pic. in red).
2. Single-row roller bearing system SRRBS
- 75 kg / 165 lbs no changes to the mechanics, blade is centered, no blade play, no visual defects. After the knife was taken apart slightly noticeable deformation on the titanium plate made by steel rollers of the bearings observed (see on the pic. in black);
- 100 kg / 220 lbs no blade play, blade is still perfectly centered, barely audible changes in the mechanics and more noticeable deformations on the titanium plate observed (see on the pic. in red).
3. Double-row roller bearing system - DRRBS
- 60 kg / 132 lbs - no changes to the mechanics, blade is centered, no blade play, no visual defects.
- 100 kg / 220 lbs no changes to the mechanics, blade is still perfectly centered, no blade play, no residual deformations, no alien sounds in the mechanics work.
For better appreciation of the pressure knives withstood, we shot several pictures of the knife bending under the load for Sergey Shirogorov custom Flipper 95 (S90V, 3,5 mm thick spine, DRRBS):
0 kg / lbs
50 kg / 110 lbs
80 kg / 176 lbs
100 kg / 220 lbs
Here is also a video spot (in Russian only unfortunately, just hope that you can get the general idea of the test from it). And sorry for bad focusing, it was the first time we shot video with this camera.
[video=youtube;UyLudvm3sKY]http://www.youtube.com/watch?v=UyLudvm3sKY[/video]
All the best and a sharp edge,
Dmitry
Hi everyone!
Last week I had an awesome opportunity to visit Shirogorov Brothers Workshop, during the talks about knives, production and knife industry development we came up with an idea to test bearings system used in Shirogorov knives in order to determine clear the advantages of specific bearing systems. Im glad that I can share the results with the community now.
We selected Flipper 95 as a most popular model and the following bearing system were tested:
- Single-row ball bearing system - SRBBS (Serial Division F95), 17 balls on each side between blade and Ti scales.
- Single-row roller bearing system SRRBS (Custom Division F95), 17 rollers on each side between blade and Ti scales, without hardened steel washers in Ti plates.
- Double-row roller bearing system - DRRBS (Sergey Shirogorov Custom F95), 27 rollers on each side between blade and Ti scales, with hardened steel washers in Ti plates.
The testing was rather simple and pragmatical we applied a vertical load* directly to the pivot point of the knife resting on two wooden bars so that the pivot had no support. Load was applied progressively to the certain magnitude, then knife was checked for damages sustained, residual deformations to the parts, changes in the mechanics of the locking and flip.
*all the figures are given both in kilos and lbs.
1. Single-row ball bearing system - SRBBS
- 30 kg / 66 lbs no changes to the mechanics, no deformations;
- 50 kg / 110 lbs - no changes to the mechanics, blade is centered, no blade play, no visual defects. After the knife was taken apart tiny deformation on the titanium plate made by steel ball of the bearings observed (see on the pic. in black);
- 70 kg / 154 lbs notable changes in the mechanics when deploying the blade slowly without applying the flip, still no blade play, stronger deformations on the titanium plate observed (see on the pic. in red).
2. Single-row roller bearing system SRRBS
- 75 kg / 165 lbs no changes to the mechanics, blade is centered, no blade play, no visual defects. After the knife was taken apart slightly noticeable deformation on the titanium plate made by steel rollers of the bearings observed (see on the pic. in black);
- 100 kg / 220 lbs no blade play, blade is still perfectly centered, barely audible changes in the mechanics and more noticeable deformations on the titanium plate observed (see on the pic. in red).
3. Double-row roller bearing system - DRRBS
- 60 kg / 132 lbs - no changes to the mechanics, blade is centered, no blade play, no visual defects.
- 100 kg / 220 lbs no changes to the mechanics, blade is still perfectly centered, no blade play, no residual deformations, no alien sounds in the mechanics work.
For better appreciation of the pressure knives withstood, we shot several pictures of the knife bending under the load for Sergey Shirogorov custom Flipper 95 (S90V, 3,5 mm thick spine, DRRBS):
0 kg / lbs
50 kg / 110 lbs
80 kg / 176 lbs
100 kg / 220 lbs
Here is also a video spot (in Russian only unfortunately, just hope that you can get the general idea of the test from it). And sorry for bad focusing, it was the first time we shot video with this camera.
[video=youtube;UyLudvm3sKY]http://www.youtube.com/watch?v=UyLudvm3sKY[/video]
All the best and a sharp edge,
Dmitry
