Your router could be spinning the bit at 20,000 rpm. Ignoring the possibility of damaging your work piece, the personal risk is extremely high. The purpose of a down cut router bit is to create a crisp edge around the hole it’s cutting so you get a good finish at the top of the cut. Despite this, it isn’t particularly effective in removing chips from holes (this is where up cut router bits come in). As a result, down cut bits are typically applied in the creation of shallow cuts, as opposed to deep grooves. However, using an imperial bit in the corresponding (well, almost corresponding) metric collet is dangerous both during the operation and when using the collet with your 6mm bits as intended afterwards. As a rough rule of thumb we usually advise the depth of cut as 1 x cutting diameter. However, in some circumstances a smaller or larger depth of cut may be optimal. Submersible Pumps - Fountain & Pond Miscellaneous and Transfer Pumps Pump Accessories Pump Controllers & Switches Hose Hose Clips Couplers, Valves & Filters Washdown Pump Kits

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Electric Pressure Washers Petrol & Diesel Driven Pressure Washers Hot Pressure Washers Pressure Washer Accessories Detergents, Chemicals and Algicides Pressure Washer Spares Hoses & Accessories A router tool has a flat base and a rotating blade that is driven by a motor. They are considered an extremely versatile power tool and can either be handheld or attached to a router table. Our UK router bits are imperative to achieving your desired design in whatever material you are working with. A down cut router bit is effective in forming a crisp edge around the hole that it is cutting. However, it is less effective in removing chips from the hole when compared to an up cut bit. Therefore, down cut bits are more commonly used for making shallow cuts rather than deep grooves. Air Compressor Filters Accessories & Consumables Air Tools and Accessories Oils & Lubricants Low Noise CompressorsMy Makita 3709 has only one collet and the instructions booklet say that it's valid both for 6mm AND 1/4" bits. Straight router bits are fairly self-explanatory. They are used to cut straight into a material to create a groove or hollow out a section. Up/Down Compression Router Bits As this router also has a 3/8" collet, you could use an adapter to get down to a 6mm shank. Now, adapters aren't great, as they're one more thing that can go wrong, but if you were desperate, you can find a 3/8" > 6mm adapter here. There is a nice bit I would love to get/use but it uses a 6mm shank. My router uses 1/4 inch shank. It is a 0.014 inch difference...is it a bad idea to get this? Is there an adapter or something if not?

Trend Rout Cutters - Trend Direct UK Trend Rout Cutters - Trend Direct UK

CNC stands for Computer Numerical Control. Our CNC router bits are compatible with computer-controlled routers. CNC routers are particularly versatile as they can perform the tasks of the boring machine, the spindle motor, and the panel saw. As with straight router bits, engraving/carving router bits are self-explanatory. They are used for engraving and craving purposes, meaning they don’t fashion deep cuts. The following chip loads in the chart are applicable for single flute, 2 flute and 3 flute solid carbide router bits that are either up cut OR down cut. These recommended chip loads are NOT applicable to compression bits Our UK straight router cutters come in a wide range of sizes allowing you to accurately cater to your project. These bits are used to cut straight into a material to hollow out a section or to create a groove.The recommended chip load & feed rate data provided below is a recommended starting point and may not accommodate all circumstances. We would recommend running at 18,000 RPM for most single, 2 flute and 3 flutes up OR down cut router bits Router tools boast versatility with the possibility of being attached to a router table or handheld. Essentially, they are comprised of a rotating blade driven by a motor and a flat base. Whichever material is being dealt with, router bits are essential to achieving the desired appearance. Down Cut Router Bits

Router Bits | Collections | Rennie Tool Company Carbide Router Bits | Collections | Rennie Tool Company

edit: On @AstPace's good suggestion, I've added a couple of relevant points from the comments trail. Always start out at the lower feed rate and work your way up from there until optimal cutting conditions and speed is acquiredElectric Heater Accessories Gas Cylinder Storage Gas Heater Accessories Propane/Butane Hoses and Regulators An up cut bit is typically used to remove chips from the hole that it is cutting. Deep grooves need to be fashioned out using continual light cuts. Up cut bits are ideal for this as the upward direction of the flutes inhibits the build-up of debris which can either break or bind the bit. As the flute removes chips it can simultaneously fray the wood fibres, causing damage. You must be mindful of this when using up cut bits and be careful to avoid implementing damage to your project.

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Up/down compression router bits create crisp edges on a board’s side when top and bottom edges alike require a clean cut. This is achieved via a spiral action that pulls both sides into the centre of the bit, ejecting out of the side. That is true for the other way around, too. You can hardly tell a difference with the naked eye, and the bits will fit in "just fine" either way.A slower feed rate is required with down cut bits as this allows more time to evacuate chips and for them to be cut into smaller pieces that fall from the slot. This does mean that you need to be careful the bit does not overheat and consequently break. This can be due to the build-up of chips combined with a deep cut. I've seen people do it, too, and they so far got away without accident or even physical injury. (Which makes the whole matter worse because that "proves" that it works.)