Bits and Bits is a long time partner of Jays Custom Creations. They create high quality router bits and offer them with competitive pricing. Check them out at bitsbits.com and use the code JAYBATES to save 10% at checkout.
In the video, I mentioned I’ll be giving away a few of the duplicate bits I have. Leave a router/cnc related comment below, and you’ll be entered. Leave a tip, trick, learning experience, or whatever bit you plan on adding to your arsenal next. I’ll do a quick video and randomly select a winner in a few days.
The following were provided by Bits & Bits. I’ll select three winners. One bit per winner.
- Winner #1 will get an Astra coated RFTD5125 1/2″ diameter spiral down cut flush trim bit.
- Winner #2 will get an Astra coated 430-CM250FT 1/4″ diameter compression flush trim bit.
- Winner #3 will get an Astra coated 430-SRF250FT 1/4″ diameter up cut flush trim bit.
Below are the notes used for the video:
Up vs. Down?
- Upcut for router table; Using the downcut on the router table with a gnarlier grain wood can push the workpiece up off the table if you’re not expecting it.
- Caveat – Down for pushing against a template for reduced tearout.
- Avoid an “enveloped cut” where the bit is surrounded on three sides by wood, instead of rough cutting close to the line and trimming off 1/16” or so.
- If you’re going to envelope the bit, we recommend a single-direction bit instead of the compression, which can get a little jumpy when it’s buried. The single direction is pulling the chips out quickly and not letting them pack into the cut pocket like a compression would.
- Interior corners may require a smaller diameter bit.
- Router speed is another issue that comes up, especially in the ¼” bits. Most guys install the bit and turn it up to full speed, but chip load applies to all spiral bits, regardless of CNC or router use. Turning the speed up to 27,000RPM + can make the bit erratic as well as cause it to dull quicker because it’s cutting dust and overheating (rubbing vs cutting). 16,000-18,000 is the recommended speed for all spirals.
- Router size is also important. A solid carbide bit is more brittle than a standard steel shank tool, we have guys sticking a ¼” bit into a 3HP+ router and over-torquing and snapping the bit after it hits a dense pocket of wood or the user moves the router too fast. The thinner ¼” work really well on the smaller trim routers, but a larger router will do much better with a ½” bit.
- The compression isn’t necessarily the ‘ultimate’ bit for trimming. It may produce the most crisp edges but most of the time, you’re going to round over or chamfer the edge anyways, so a little fuzz doesn’t really matter in the long run.
- Integrated depth stop on the ⅞” bit. You can’t take a massive bite. It just won’t allow it.