Surfacing Tool With Superior Finish Quality

Now in stock:  A surface planing cutter (Fourcut™) that provides an excellent quality, smooth surface finish!  Specifically designed for applications such as MDF shaker doors and other surface planing requirements in solid wood or MDF,  the Fourcut™ is one of the best economical hardware and tools for production needs where impeccable finish is a MUST!

GDP|Guhdo’s New Fourcut™ Planer

This cutter is engineered with carbide insert knives (PCD Diamond insert knives optional!) that feature special geometry to facilitate a fuzz free finish.  Inserts are 4 sided, providing 4 separate cycles for economical machining cost.  Since old collets or poor quality tool holders can affect the performance of this tool, we highly recommend purchasing on an HSK heat shrink tool holder for exceptional results!

Two Options Available: A 40 mm 3 wing cutter is available from stock, with an 80mm diameter tool also available as a standard when larger surfaces require top quality finish.

If using this for shaker door production, additional passes are required with separate router bits for achieving the square corner effect since a 20mm radius will remain needing corner cleanup.

Both options are manufactured with high quality steel, precision balanced and Made in Germany!

Regardless of your surfacing application the Fourcut™ will maximize your run-time without sacrificing finish. For applications that require longer run-times, the PCD option is a great alternative!

GUHDO USA Inc. Rebrands as GDP|GUHDO

GUHDO USA Inc, a leading importer of precision industrial tooling into the North American markets, is becoming GDP|GUHDO with the launch of a robust, cutting edge new website and diversified industrial focus.  With the transformation and addition of the GDP product program, GDP|GUHDO will continue to provide high-quality state-of-the-art tooling solutions to the woodworking/composites and plastics industries while also adding select tooling for metalworking to its offering.


The new website will make ordering tooling convenient, allowing the customer to keep track of past orders as well as overall tooling spend.   Additionally, the website is mobile and tablet friendly, allowing customers to instantly consult directly with GDP|GUHDO technical staff from a mobile device.

Up vs Down Shear Router Bits

Ever wondered what the difference is between up and down shear router bits? To the untrained eye, telling the difference between these bits can be difficult if you see them sitting side by side; however, once you see them rotating, the difference becomes clear.

Up vs. Down Spiral (down on right)

Up vs. Down Spiral (down on right)

The major differences between up and down shear bits are the chip evacuation rate and the finish quality.  Up shear bits are used for faster feed rates and deeper holes where chip evacuation is key (although multiple passes are still suggested for deep holes and mortising). The upward rotation prevents debris from littering the cut which reduces friction and edge wear. While this is great for chips it can create finish issues if used incorrectly as the upward rotation (which creates lift) will potentially fray fibers around edges.

The down shear bit leaves a very crisp edge but is less effective with chip evacuation, which can lead to excessive friction and tool wear if not run correctly. Down shear bits are a good choice for cutting shallow grooves or dados with visible edges. One other note – down shear bits are generally run slower than up cut bits due to the chip evacuation speed. This is another reason for cutting shallow grooves in multiple passes vs going deep on one pass. The slower feed speed allows the bit more time to evacuate chips which will help avoid excessive tool stress or friction. The down shear carbide spiral bit is far more popular because many router tables have less than efficient, vacuum hold-down which makes the up-shear bit want to lift the panel with it’s upward cutting motion.  This results in unacceptable vibration and movement of the panel.

So which is right for you? Ultimately you want to have both up and down cut bits on hand so you can select the right bit for the cutting situation. If you have the same repetitive action on consistent material you should see if Diamond PCD is an option over Solid Carbide as the cost savings over time can be considerable.

Have questions on this or anything else? Don’t hesitate to contact us!