My Makita 3709 has only one collet and the instructions booklet say that it's valid both for 6mm AND 1/4" bits. 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. 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. 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. 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.

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. 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. 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. 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.We would recommend running at 18,000 RPM for most single, 2 flute and 3 flutes up OR down cut router bits

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. 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.)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 acquired 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 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. The recommended chip load & feed rate data provided below is a recommended starting point and may not accommodate all circumstances.

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. 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?