Why Tradesman DC Brief history Questions and Answers
In the beginning:
We needed a reversing variable speed motor for a new tool grinder.
Jeff , was going to redesign the venerable old CUTTERMASTER The world had changed since 1972 and it needed some help. In 2010 the Cuttermaster Professional was born using a Bodine Motor and control.
We bought one of every motor we could find and arrived at DC being the only thing that would work because of its smooth quiet yet powerful variable speed characteristics.
The control: We designed our own board, but landed correctly on KB electronics KBw16 and KBws25
The Wheels: This is a good story we landed a contract to sharpen 100000 plus tools for Boeing Canada. in 2007 (this started the Tolgrinder design project,I bought 2 Darex M5 drill sharpeners and soon was wearing out super abrasive wheels, so we designed our own in 2008 we now have 50 or so wheels that have been designed to be better than the ancient designs that were available.

2023 Tradesman 892 Woodturner
New redesigned Body assembly and Covers to accommodate the 92mm 130 VDC
The New Thrust flange design captures better wheel run out.
New Motor SCR Control board UL and CU and Rohs State of the art.
Faster Torque Compensation
The new 92 mm Motor with Patented Enhanced Magnetics is far more effective at 8-inch wheel speeds (lower RPM)
New Close reach Mitre Rest Mitre Rest Jig Plate – Close Reach – Cuttermasters
In this arena, this is the only machine designed to run Superabrasive wheels and make them last.
Theres Nothing like it
Jeff

Tradesman Power Strop Precision Blade Hone
The Tradesman Power Strop is a new machine for those who want to add a honing station
100 to 1000 Rpm Reversing 250 mm Ground Harness leather wheel
Machined Aluminum Core, Bonded Leather rim
(Ground after Bonding to match the 250 mm CBN wheel Diameter)
Use with any honing compound, Tradesman Spray on Blade Magic is recommended.
Tradesman Honing compound is a hand-applied mist spray of 1500 Grit Aluminum Oxide powder, or
CBN 2500 (6 Micron ) XL Sharp or Fabricated Crystal (Tap Water Mist).
Deburs quickly leaves a nice finish and leaves the stropping wheel clean and dry for the next application
For the bladesmith who has everything
110 220 V 5 amps

Tradesman Power Strop , Precision Blade Hone (available Jan 17 2023)
100 to 1000 Rpm Reversing 250 mm Ground Harness leather wheel
Machined Aluminum Core, Bonded Leather rim
(Ground after Bonding to match the 250 mm CBN wheel Diameter)
For the bladesmith who has everything
Santas Chief of Staff
(Jeff)
How to sharpen a knife to a very sharp edge
How to create a very sharp edge
The best approach to grind the knife bevel:
Use progressively finer grit wheels working towards a small uniform burr that can be accurately removed with a strop
or edge honing process using very little pressure leaving a very sharp edge.
It’s all about understanding the material being sharpened, the process being used, and the accuracy of that process.
KG” A good sharpener knows how to apex and deburr the edge; an expert sharpener knows how to clean the apex of the weak wire edge not rounding it”
Grinding or machining most materials, a burr will develop at the edge.
The Burr should be suitable for honing: Grind the knife bevels progressing thru wheel grits to a fine positive burr.
Our take on burr characteristics regarding positive and negative burrs.
Based on knife grinders’ observations and testing: A very good starting point.
Knife Sharpening to a very sharp edge explained
Grind the knife bevel using progressively finer grit wheels working towards a small uniform burr that can be accurately removed with a strop or edge honing process leaving a very sharp edge. Its all about accuracy.
KG” A good sharpener knows how to apex and deburr the edge; an expert sharpener knows how to clean the apex of the weak wire edge not rounding it”
Grinding or machining most material, a burr will develop at the edge.
Produce the perfect burr and then honing to the perfect edge.
Controlling the size and shape of the burr is essential when sharpening a knife bevel.
Producing a burr suitable for honing:
Grind the knife bevels progressing thru wheel grits to a fine positive burr.
Based on knife grinders’ observations and testing: A very good starting point.
MALLEABLE POSITIVE BURR | BRITTLE NEGATIVE BURR |
A high foil-like burr on a thin root.
A burr created edge-trailing, with conventional aluminium oxide and silicon carbide abrasives, and natural stones, using excessive pressure or high grinding speed. |
A small stiff burr on a wide root.
A burr created edge-leading, with CBN/diamond abrasives, using minimal pressure and low grinding speed. |
A positive burr is a light feathery burr commonly produced by an edge trailing grinding process (wheel direction turning away from the edge)
2. Set bevel angle using appropriate grit (320, 600?)
3. Set edge using appropriate grit (KG uses 1000)
4. Determine if the burr is positive or negative based on KG chart – steel (reference 2)
5. Differential Honing step 1 (positive for most commercial knives) one at the exact edge angle*, it will hone away the bulk of the burr with a 3-6 micron honing substrate
6. Differential Honing step 2 (positive for most commercial knives ) and the second at a 0.4 – 2 degree higher angle depending on the steel (e.g. a 15 dps edge will be honed at 15.4 – 17 dps), it will hone away the burr root and has 1-micron honing substrate.
- “best performing edge angle is the lowest possible for given steel” (KG 2019)
- “Quality higher-end knives: double-bevel 10 dps, single-bevel 15-16 dps; Mainstream knives: double-bevel 12 dps, single-bevel 20 dps; Wear-resistant premium knives: modern PM steels 13-15 dps, and traditional tool steels 15-20 dps, as explained in the chapter on high end knives (KG 2019)
- “Our sharpening workshop default edge angle for commercial kitchens is 12 dps (KG 2019)
- “Getting rid of the gnarly burr cheapo knives usually produce is so difficult that you can clean the edge apex only at the cost of rounding it (KG 2019)
Reference 2 – Know your material so that you can choose the best deburring method –
- “Positive burrs are produced in tough ductile steels, while negative in hard and brittle. The positive burr base is deburred by honing at a higher than the edge angle, while negative can be deburred by honing at the edge angle (KG 2019)
- “It is plainly impossible to deburr a blade with a malleable burr (formed on mainstream stainless knives) by honing it edge-trailing at the edge angle” (KG 2019) ““Feather burr” and “Foil edge” are two more edge geometries that can be created in the finishing stage of removing the burr; these two are near synonymic and are a product of edge-trailing honing at the edge angle (KG 2019)
- “an edge sharpened at 20 degrees will require more deburring efforts than the edge sharpened at 40 degrees (KG 2019)
- “honing the positive burr at the edge angle shapes it into a wire edge that won’t last while honing the negative burr at an angle higher than the edge rounds the edge causing an avoidable loss of keenness (KG 2019)
- ” proper deburring requires a minimum of 2 steps”