Face Shields, Sneeze Guards, Machining Plastics and Acrylics

While we have found ourselves in the midst of a situation no one could have imagined we would ever be in, quite a few of our customers have to stepped up and contribution their production capacity and be a part of the solution to nationwide shortages of personal protection needs. For those volunteering their time and efforts, we commend you!

In this article we will highlight particular tools that may be needed in the production of urgent supplies. The common applications that we have seen among our customers has been for face shields and sneeze guards.

Parting Material for Face Shields

The material that we have found most common for the face shields is .02″(.51mm) PETG. Typically we would suggest a Polished O-Flute up-cut bit for most rigid plastic materials. The reason for this, is to get the plastic chips out of the cut so they won’t melt and form back to the material. However, when you cut material that is .5mm thin you have the risk of an up-cut bit pulling the material off the table. An alternative bit for this is a Straight O-Flute as it won’t have the tendency to pull the material off the table. Some CNC Machine have a “shoe” that is under the shroud that applies pressure on the material which in this case an up-cut can work. If there is no shoe and the material is very thin we recommend a Straight Polished O-Fute.

Should I go with 1 Flute or 2 Flute Bits?
Due to the nature of face shields, being typically sized 9″ x 9″ (with a radius on the corners) the machine has trouble getting to full speed before it reaches the next turn, so a single flute is a better choice. If the tool has 2 Flutes and is not moving through the material fast enough, the chip load will be too small, creating excess heat and cause melting.

Cutting Material for Sneeze Guards

Sneeze guards, which are commonly seen in use at grocery stores, banks and gas stations, are manufactured with a more rigid plastic and acrylic than the face shields. The most common thicknesses that we have encountered are 1/4″ and 3/8″. For machining these, a Polished Up-cut O-Flute router bit will work best.

Rounded Edge
Some customers have found that that it’s easiest to finish the edges with a Solid Carbide Rounding Edge Straight/Upcut Bit. The style of cut depends on how strong your material hold down is. We recommend a Straight O-Flute for weaker material hold down and Up-Cut for stronger material hold down.

We want to thank all the customer’s that are donating their time to provide resources to the healthcare industry, if we can provide any information to assist with the production of the live saving equipment please reach out 800.544.8436

New Start Up CNC Tooling Package

Need to tool up a new CNC machine?  

GDP|GUHDO has introduced a special priced CNC tooling starter package which provides a substantial savings on highest quality tooling.  This kit includes 8 HSK tool holders (choice of style based on collet style preferred (SYOZ, ER40 or ER32) and  corresponding 8 collets (choice of sizes).  In addition, the customer can select 14 solid carbide bits (4 downcut and 10 compression styles) and 10 drill bits based on sizes needed.  This package also includes a tool setup fixture, torque wrench with collet key and a spoil board cutter, which comes mounted on an heat shrink tool holder.  Finally, a box of replacement insert knives for the spoil board cutter are also included.

After receiving feedback from our customers regarding a desire for flexibility to get what is actually needed in a starter package, we customized this tooling package to allow the customer to choose which bits are needed.

This package is available at a special  price of $3499.00.

For more information, contact [email protected] or call us at 800-544-8436

8 x  HSK-F 63 Precision Tool Holders

(Made in Germany) supplied with ball bearing collet nuts (superior quality to static collet nuts).  Choice between ER32, ER40 or RDO 35/SYOZ25   collet style.

8  Collets

 Choice of collet style and size.
RDO 35 (SYOZ25), ER40 or ER32 style.

Spoilboard /  Surfacing Cutter on HSK Heat Shrink Chuck

The spoil board cutter is supplied mounted on an
HSK-F63 heat shrink tool holder.  Includes one box of replacement inserts.

Tool Setup Fixture  A tool setup fixture is essential for accurate tool setup and proper tool tightening.  It can be mounted to work bench or table.
Torque Wrench and Collet Key A torque wrench and a collet key which corresponds to the collet style being used.
Down-cut Spiral Bits (4) : Choice of 4 down-cut spiral bits  (any size 1/2″ or smaller)
Compression Spiral Bits (10) :

Choice of 10 compression style bits (any size 1/2″ or smaller), any carbide grade (for wood, composites or melamine) and chipbreaker style option if machining plywood.

TCT Drill Bits (10):     Choice of 10 drill bits of any standard diameter x 70mm overall length and choice of brad point, thru hole style or hinge boring bit.



At GDP|GUHDO, we have put our resources together to provide a comprehensive CNC Tooling Guide. This guide is designed to provide the knowledge to support the most efficient use of your CNC tooling.  We want to put the information into your hands any way that you can use it, so we also have a downloadable link to a PDF version of the presentation here.

Below is a directory for both the video presentation and the PDF presentation.

Topic Slide # Time
Introduction to CNC Tooling 1-7  0:00
Tool Holders and Clamping Systems 8-22  3:37
Drill Bits and Adapters 23-26  10:11
Sizing Jointing Rebates, Dado Cuts and Grooving 27-47 11:30
Other Common CNC Tooling 48-53 22:57
Material Specific Tooling 54-63  25:52
Profile and Custom Tooling 64-68 28:54
Saw Blade and Grooving Adapters 69-72  31:33
Other Tool Tips 73-80  32:32


Corrugated Knife Adapter for CNC

GDP | GUHDO offers a cost-effective solution for prototypes and small runs. This corrugated head adapter (Series 4524) comes in 40, 60 and 80mm width and is supplied on an HSK-F63 heat shrink tool holder for use with 5/16″ corrugated knives.  Total weight, including knives and tool holder as shown is less than 7 pounds.  The carrier body is steel, a prerequisite for safety since the corrugations machined into an aluminum head would eventually wear out and knives could become dislodged.  For more information, contact GDP at 800-544-8436