We offer four different models:
Compare Drag Knife Models
D1 & D3 Drag Knife
for CNC Routers
Our D1 & D3 Drag Knives are optimized for detailed work in thinner materials with a depth of cut from 0.010 in. to 0.0625 in. (1/16 in.) thick. Curved cuts as small as 1/16 in. radius are possible with these tools. The D1 fits in a 1/2in collet and the D3 fits in a 1/4in collet.
D2 & D4 Drag Knife
for CNC Routers
Our D2 & D4 Drag Knives can handle thicker materials from 0.010 in. up to 0.250 in. (1/4 in.) thick. Curved cuts as small as 1/8 in. radius can be made with this tool. The D2 fits in a 1/2in collet and the D4 fits in a 1/4in collet.
1/2″ Drag Knife
for CNC Router
Our 1/2″ Drag knife can handle thicker materials from 0.010 in. up to 0.50 in. (1/2 in.) thick. Curved cuts as small as 4.25 in. radius can be made with this tool. The 1/2″ knife fits in a 1/2in collet.
* If you are cutting material thicker than 1/8in, the minimum cut radius on the D2 or D4 increases to the material thickness
** Offset values are approximate because results may vary from machine to machine and material to material. In general, if your blade is overturning at corners, reduce the offset. If it is under turning, increase the offset.
Patent Pending
Order Your Donek Tools Drag Knife Now!
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D1 Drag Knife
$269.00 -
D2 Drag Knife
$269.00 -
D3 Drag Knife
$269.00 -
1/2″ Drag Knife
$269.00 -
D4 Drag Knife
$269.00 -
Creasing Attachment
$149.00 -
SheetCAM Software
$210.00 -
Irwin Utility Blades – 50 Pack
$20.00
The Donek Tools Drag Knife fits either 1/4″ or 1/2″ CNC Collets*
*D1, D2 & 1/2″ Drag Knives fit 1/2″ Collets
*D3 & D4 fit 1/4″ Collets
The Genuine and Original Donek Tools Drag Knife
Cut almost anything you would cut with a utility knife, but with the speed and precision of a CNC Router.
Uses “off-the-shelf” bi-metal utility blades
The tools were designed to use a utility knife blade (though a specific type) which dramatically reduces the cost of consumable blades.
Cutting Depths from 1/16″ to 1/2″ *
*D3 & D3 Drag Knives Max Depth: 1/16″
*D2 & D4 Drag Knives Max Depth: 1/4″
*1/2″ Drag Knife Max Depth: 1/2″
About the Tool
The Donek Tools Drag Knife can be used to cut almost anything you would cut with a utility knife, but with the speed and precision of a CNC router.
The Donek Drag Knife fits into your CNC router or spindle collet, making it a universal fit for almost any CNC router available. The tools were designed to use a utility knife blade (though a specific type) which dramatically reduces the cost of consumable blades.
Donek Drag Knives are being used in industry and by hobbyists to cut snowboard and ski base materials, wood veneer for inlay/marquetry artwork, leather, carbon fiber pre-preg laminates for aerospace, military, and automotive components, cardboard for custom packaging, and much more. Whether you want to perform delicate veneer inlay work or cut out cardboard boxes with your CNC router, Donek Tools has a tool right for the job.
Tools that fit in 1/2in and 1/4in collets are available.
We have extensive detailed information on the capabilities of these tools and how to used them on the other pages of this site. If you can’t find answers to your questions, send us an e-mail to [email protected] or give us a call to inquire further. We can be reached by phone at 303-913-4263
Frequently Asked Questions (FAQ)
What can the Drag Knives cut?
The general rule is: if it can be cut with a utility knife, it can probably be cut with a Donek Tools Drag Knife. What follows is a list of materials, we, or our customers, have cut with our Drag Knives.
- Plastics: UHMW Polyethylene, ABS, Lexan Film
- Cardboard: Corrugated and paperboard
- Coroplast (Corrugated plastic sign material)
- Vinyl: Sign and sticker vinyl
- Paper: All kinds
- Foam: Foamboard such as RL Adams Rediboard
- Wood Veneer – we prefer paper backed, but straight veneer works too
- Pre-preg carbon fiber laminates
- Leather (Thin and thick materials work well)
- Fabric: All sorts including dry fiberglass, carbon fiber and kevlar (Special vacuum fixtures may be helpful if you are not using the creaser and rotary cutting blade)
- Gasket Materials
How does the blade turn?
The tip of the blade trails behind the motion of the CNC. The precision bearings in the tool allow it to freely rotate and act much like the castor on an office chair.
Sharp corners are achieved with what are referred to as corner actions within the CNC tool path. These corner actions instruct the CNC to raise the blade such that the tip is just barely in contact with the material surface. The machine then moves through a very small circle around the tip of the blade causing the blade to rotate, while the tip of the blade remains in the same location. The machine then moves the blade back to the cutting depth and resumes cutting.
Do I need special software?
No special software is required if you do not need or require sharp corners in your cuts. If you round off or fillet all the corners on the part you intend to cut, you can simply treat the Drag Knife as an engraving bit and cut on your vector/line. Care must be taken when creating your tool path to ensure the tool starts and ends on each cut in the same orientation.
If you want to cut sharp corners in your cut parts or do not wish to worry about blade orientation at the beginning and end of each cut, you will need either SheetCAM, Vectric VCarve Pro 7 and higher, or Vectric Aspire 4 and higher. All of these CAM packages offer drag knife tool path capabilities with corner actions. SheetCAM Offers offset compensation as well making it possible to cut details smaller than the tools offset as well as producing greater precision in your finished part.
Why should the spindle/router always be turned off?
The spindle or router does not provide the rotation of the blade. The blade acts as rudder and is oriented by the motion of the machine. For more on this see “How does the blade turn” in the above answer.
The Drag Knife is not balanced for high speed rotation. If you supply power to your router or spindle while it is installed, you could do damage to the router or spindle bearings. Unbalanced spinning objects can also do very unpredictable things causing severe injury to anyone within their vicinity.
Will it work with my CNC?
There are only 2 requirements for a Donek Tools Drag Knife to work in a CNC machine. It must move in the x, y, and z directions and you must have either a 1/2in or 1/4in collet for holding the tool.
How do I turn off the spindle on my MultiCAM machine?
- Select “Menu” on the hand controller.
- Select “Utilities”
- Select “No Spin”
- Enter tool number
- Press “enter”
- Disable “No Spin” by returning tool number to “0”
Special thanks to Dan C. Gartin from Custom Mobility Inc. for this answer
