Reverse rotation router - Page 2 - Router Forums
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post #11 of 25 (permalink) Old 01-13-2010, 03:42 PM
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You might be better off mounting your routers over top of a two tier table (one piece on the bottom and one on the top). Each tier would have to be angled slightly relative to the pivot point for the routers. You would connect them together on one carriage that would slide in and out and move up and down you could use a linkage to rotate them positionally but the pivot point for the router carriage would have to be a long way from the router to minimize the distortion. You have picked a really challenging problem. Have you considered doing a CNC router instead?
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post #12 of 25 (permalink) Old 05-17-2011, 08:26 AM
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Originally Posted by RustyW View Post
Have you had any luck finding bits that cut the opposite direction?
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Originally Posted by mach2_man View Post
This was going to be another topic but since you brought it up. The only way to get reverse directional router bits would be to have them custom made.
Actually, having some experience with such things (see my introductory post if you are so inclined), I immediately thought about milling bits. Some of the more aggressive carbide bits I use are quite similar to some of the less aggressive wood bits for my router. They are available with both 1/4" and 1/2" shanks and in "left-handed" versions. I have used milling bits in a woodworking router to shape aluminum; why not use them in a router to shape wood?

You might consider getting a mandrel (with a 1/2" shank) that will mount "shaper-style" bits. (I use these in a metal mill, why not in a router?) They would let you use "carbide insert" type bits that could be "turned over" to get a left-handed cut. You could also "grind your own profile" pretty easily if you were using inserts (note: at the speeds your router turns, you'd want to be VERY careful with the grinding to get all the "teeth" the same size and shape -- make a jig!) Do keep in mind that any mandrel bits or any non-center-cutting milling bits will not "plunge cut"; you will have to "work from an edge" with these.

Also, there is a series of "Left Hand Plunge Router Bits" available if "straight" cuts are what you want. Being new here, I cannot post the link directly; however, if you go to "dubU, dubU, dubU dot toolstoday dot com" and do a search for "left hand router bits" you should find a number of bits, including one dovetail, made by Amana Tool. (Note: for some reason, if you search for "lefthand router bits" instead of "left hand router bits" the dovetail bit doesn't show up -- go figure!)

Hopefully, this post isn't too late to help with your project!

-101-
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post #13 of 25 (permalink) Old 05-17-2011, 09:21 AM
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There are many left handed cutters, certainly not for all occasions, but straight and dovetail cutters, e.g. are available.
I'd be more concerned with the collet and other stuff loosening, if all the stuff under load, were not also reverse threaded.
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post #14 of 25 (permalink) Old 05-17-2011, 09:27 AM
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Hi

Say what,,,I have not seen one router that can turn a bit in reverse so why would you every want to buy one. mill yes drill motor yes but for a router NO.


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post #15 of 25 (permalink) Old 05-17-2011, 11:38 AM
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Not garden variety, as mentioned, but SET, Onsrud, Amana, WMC et.al are sources for counter-rotating (left handed) bits.
Lots of surprises in RouterDom.
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post #16 of 25 (permalink) Old 05-17-2011, 01:04 PM
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I'd like to see a sketch of the proposed machine. I don't understand why a reverse turning router is needed. Thanks.

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post #17 of 25 (permalink) Old 05-18-2011, 08:41 AM
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There ARE router motors which turn in either direction, however, they are specifically built for use on pin routers and CNC routers - those are also the tools that LH bits are made for. As to two cutters running in opposite directions, that is also exactly how industrial parts copiers (the sort of tools which are used to produce flat chair legs, etc in the furniture industry) work - the workpiece is attached to a template which runs between two vertical spindles which are pneumatically held onto the template. Biggest problem with industrial LH motors is that the tool holders, collets, etc are only are made for RH rotation so they need to be clamped up very tightly and checked regularly.

If an 18,000 rpm motor can't be found why doesn't the OP consider the approach once used in smaller industrial overhead pin routers, a 3000 rpm (in USA 3600 rpm) induction motor with a drive pulley attached, a flat belt and a second spindle with a larger pulley on top. The circumference ratio 1:6 would give a spindle speed of 18,000 rpm (21,600rpm in the USA) which is adequate for many tasks and which is about as fast as you can go on steel bearings (24,000 rpm really needs ceramics or other technology bearings)

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post #18 of 25 (permalink) Old 05-18-2011, 11:17 AM
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Reverse rotating router motors and bits are for special built production machines only. There is no advantage in using them. Router rotation direction is a world wide standard that some engineers decided to ignor in order to sell expensive bits and parts. This is why you find signs in most industrial tool rooms with sayings like: "Flush twice, it's a long way to the Engineering Department" or: "Let's play Engineer. You design something wrong and I'll make it work."

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post #19 of 25 (permalink) Old 05-22-2019, 11:27 AM
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Exclamation Reverse run on router

I bought the snauzer on eBay it came running in reverse Im trying to reverse it no luck so far
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post #20 of 25 (permalink) Old 05-22-2019, 01:53 PM
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Quote:
Originally Posted by Leswilliams View Post
I bought the snauzer on eBay it came running in reverse Im trying to reverse it no luck so far
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Is Snauzer the brand name of the router? Also is it a router or a spindle?

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