Also, I've thought about a reversible shaper, but they all seem to be built into a table and I'm not sure how I would integrate that into my current table.
I'm just trying to find a spindle large enough diameter to put into a router table lift. Alibaba probably has one, but searching for spindle brings up too many things. When I finally find one I'll post it here for posterity.You might want to look into using a spindle instead of a router. They can be easily reversed and are built for continuous use.
Thanks for exposing all the obstacles in the way of the concept! You must have thought or read about this yourself!I doubt that a bidirectional router will ever happen, there are too many issues with the concept.
People having problems with bits climbing in collets are more common than most would like with the collet thread optimised to tighten with normal rotation, when you reverse rotation, the collet would want to release and throw bits.
The armatures are normally advanced relative to the the field windings for better efficiency and more power in the normal direction of rotation, attempting to operate in reverse direction with the same timing in the armature would lower efficiency and output power.
The motors are fan cooled with a fan integral to the armature, the blades being set to exhaust air toward the bit to try and keep dust clear and improve user view of the task, and also to avoid drawing dust into the high speed, minimal air gap motor. Being able to reverse the motor would suck dust into the motor and clog it fairly quickly.
Users often find themselves confused about appropriate feed direction differences between working on external surfaces vs internal surfaces, being able to operate the motor in reverse would add greatly to this confusion by adding another pair of potential scenarios to consider.
Finally, what diameter bits would you want to be running, could the variable speed systems slow the motor enough to retain a safe tip speed while maintaining torque to do the job, overall efficiency and adequate cooling? Do you really want someone trying to run a router with a heavy bit hand held?
Manufacturers potentially could make a dedicated reverse rotation model with timing, collet threads, fans etc optimised for the reversed rotation, but that would be a very limited market in comparison to the regular models sold worldwide, and potentially a further source of confusion for those not knowledgeable about routers.
There are two types of tool users: Those who use what's available and imagine something better and those who accept them as they are....I can't imaging a good reason much less safe one for this to be done.
I inquired recently about a reversible router and got called everything but foolish. Out of several discussions, the most critical design change would be in the collet. Either a left hand threaded nut and spindle or a bolt drawn collet through a hollow spindle would be the best options. Do a search of 'Reversible Router" for the particulars.My job involves rounding over many thousands of small (2x3 inches) wooden parts. I have a VERY custom setup that's pushing small pieces through a table mounted router very quickly. Currently, I'm processing about 2 pieces per second. It's taken me about 6 years to get to this point. In order to process both sides of my piece, I currently have to put them through the machine twice. This turns out to be quite expensive in terms of labor, so I'm ready to spend the money necessary to fix this problem for real. The simplest way to optimize would involve a second router on the other side of the track spinning in a reverse direction. I've found a supplier for reverse bits. I understand that there are spindles that allow for reverse rotation, but I don't know how to mount them under the table in a way that I can easily adjust the height of the blade. I really like the SawStop router table lift that I got but I don't think it will mount a spindle, though the Jessum looks nice too. I've heard that you can mess with the wires inside a router to reverse the rotation, and this sounds doable, but there may be issues with the bit mount loosening up over time and I'm not sure if it would affect the life time of the router. Ideally, I think, a spindle mounted under the table sounds like the right approach, but I'm open to other suggestions. However, I don't know of a spindle mount that goes under a table in the same way a router table mount does. Any suggestions would be most welcome. If you want to propose a custom build, money shouldn't be a huge issue on this one. If anyone knows of a round spindle, that would also be super helpful. I'm not sure why they are all mostly square. No idea is too out there on this one.
I recently machined a piece of 4140 (gun barrel steel) to adapt the old style interchangeable Craftsman carbide bits to run at an extended height since I couldn't find a way to run them backwards, although it is possible to run then in reverse if the lock nut is threaded left hand when you make the spindle.Have you had any luck finding bits that cut the opposite direction?