Today we look at the differences between Type 27 and Type 29 Flap Discs and Type 1 and Type 27 Cut Off Wheels
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What is the difference between a Type 27 and a Type 29 Flap Disc?
A Type 27 flap disc is referred to as a flat disc. It is best used at a 0-15 degree angle. Type 27 is used for grinding the plane and outside corners. In the bucket program we see lots of Type 27 discs used only on the edges so the recommendation is to switch to a Type 29 disc.
A Type 29 flap disc is referred to as a curved disc. It is best used at a 15-25 degree angle. The grinding surface of the curved flap disc, Type 29, has an upward curvature, allowing it to grind at a steeper angle. It is mainly used for grinding of corners and edges. When speed and cutting ability have higher requirements always recommend the Type 29.
What is the difference between a Type 1 and Type 27 Cut Off Wheel?
A Type 1 Cut Off Wheel is a flat wheel used on the edge. The number one drawback to this disc is the exposed mounting hardware that does not allow a flush cut but allows cutting all the way down to the mounting hardware. The Type 1 will give the maximum number of cuts and is usually the cheapest to buy. It must be used at a 90 degree angle, any deviation from this will result in breakage, which happens frequently.
A Type 27 Cut Off Wheel is often referred to as a depressed center wheel. The mounting hardware is in the depressed center, allowing for flush cutting. The Type 27 Cut Off Wheel must be used with an appropriate guard and a depressed center back flange. The center hub protects the user from cutting too deeply. The hub also allows for avoiding reinforcement wear and for extra rigidity for additional safety. The Type 27 produces 20% less cuts than the Type 1 on average.
A Flap disc, which is distinctively different from a flap wheel, is an abrasive disc that is used with die grinders and angle grinders. Theyre designed with overlapping coated abrasive flaps, that look like overlapped pieces of sandpaper, attached radially to a backing plate. They also have an open center hole, screw on-screw off hub, or a quick change attachment.
Unlike conventional grinding wheels, flap discs are made up of flaps of abrasive materials. This makes them available in various types of materials as well as a wide range of grits.
While flap discs vary in size, abrasive material, and grit, they also vary in an important factor that affect different grinding needs. That is the angle of the discs. The two types known as T27 and T29 discs are what well compare in this article.
For a more in-depth look at Flap Discs themselves you can find our full flap disc guide on our blog.
If youre new to angle grinders it is good to know that these are an extremely popular abrasive tool for the angle grinder. Flap discs are favored among operators due the fact that flap discs are lighter in weight, easier to control, and they feature cooler cutting which is visible in its reduced gouging and burning. They are used for surface blending, removing paint from metal, smoothing, edge, and contour work. It's a handy tool that can be used in place of sanding discs or grinding wheels quickly with a lot of the same outcomes.
T27 is the flat flap disc of the two different types of discs.
They work best from a 0-15° angle and are the best suited for smooth finishing. The flat-angled flap discs are primarily used on flatter surfaces. They are extremely popular and lauded the best choice for smoothing and blending.
With competitive price and timely delivery, Hengxuan Abrasive sincerely hope to be your supplier and partner.
For a more complete finish, we also offer polishing flap discs made of Australian wool felt flaps arranged in the same style as our abrasive flap discs.
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A T29 Flap Disc has a conical shape and has an angle when you look across the abrasive material.
They work from an angle of 15-25°. This angle allows the T29 flap disc to be used for both edge and contouring work. They are favored due to the angle that allows for the operator to have greater surface coverage for stock removal on flat surfaces.
The curved angle of the T29 Flap Disc allows for more leverage and thus more pressure in their use which would allow the user to grind more aggressively than with the T27 Flap Disc. The angle of a T29 Flap Disc also allows for polishing and grinding at one time increasing productivity of the operator.
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As you can see in this side by side comparison of a T27 flap disc and a T29 flap disc, the face of the sanding discs have a different shape. The T27 discs are completely flat while there is a slight angle/conical shape to the T29 disc face.
At Empire Abrasives we want to offer our customers the best products and one of those is our High Density XL Flap Discs that come in T27 and T29. These Flap Discs come in both Zirconia and Ceramic and are longer lasting than a standard flap disc. This will allow the operator to do more with less disc changes. Your productivity increases as does the life of the disc when you buy the XL High Density flap disc. These are perfect for both commercial and non-commercial use.
Which one should you buy?
While using them can boil down to preference it is also good to take a look at the project you are trying to complete to choose the right disc for your work. The T29 is the best choice if youre working on a contoured surface or looking at speed and stock removal as the primary function. Whereas, the T27 would be the best choice for quickly working on flat surfaces or blending and smoothing your finishes.
Still have some questions or not sure which flap disc is right for you? You can chat with an expert from 9-5 EST on our website or fill out our contact form.
Contact us to discuss your requirements of aluminum oxide flap disc supplier. Our experienced sales team can help you identify the options that best suit your needs.