Feed Direction, Complicated?

Bob N

Great thread guys and very helpful to me at least

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<<<__Bøb__>>>

Very simple to remember .. . ROUTERS ALWAYS WANT TO GO LEFT !!

If you push a running router into a piece of material, it will pull to the left .. simply take advantage of this fact.

rwyoung

Harry -

Should we now explain the right hand rule as applies to electro-magnetics?

(Or as we used to call it in school, "electro-magics"...)

harrysin

The right hand rule applies to generators and the left to motors to predict the direction of rotation when the direction of current flow and magnetic field are known, and my memory tells me it was Mr. Fleming who came up with it, I seem to remember that there is another method known as the grip rule but it's all too long ago.

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Harry

The best advice that I can give a newcomer to routing is, learn to use the router mounted, this can be as simple as a board held in a vice, with the router firmly attached and a simple fence held with clamps, and when he/she feels competant and confident in it's use and is familiar with all aspects of safety, THEN, and only then proceed to learn how to use the router hand held. This is MY opinion, and may or may not coincide with that of the forum management, but is based on a lifetime of woodworking.


http://members.dodo.com.au/~sharry02/

harrysin

This would seem to indicate that there is no difference routing the outside of a circle and routing the inside of a circle. Perhaps a little more explanation is required for this old man.

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Harry

The best advice that I can give a newcomer to routing is, learn to use the router mounted, this can be as simple as a board held in a vice, with the router firmly attached and a simple fence held with clamps, and when he/she feels competant and confident in it's use and is familiar with all aspects of safety, THEN, and only then proceed to learn how to use the router hand held. This is MY opinion, and may or may not coincide with that of the forum management, but is based on a lifetime of woodworking.


http://members.dodo.com.au/~sharry02/

derek willis

It's strange, you know, I looked at the first post and had to think how to do it, I've been doing it for more than 20 years and it is all automatic, frankly, I could not have answered the post straight away,
I can assure you I am not new to routing in any manner at all.
I shall have to read up on what you have all said and try to remember.
Derek

rwyoung

http://hyperphysics.phy-astr.gsu.edu...ic/magfor.html

is a good on-line reference.

Harry, I think you may have spent too much time watching the water spiral out the wrong direction down there...

RHR for current in a wire, point thumb in direction of conventional current flow (yes, DC, if it is AC, then you will need to be flipping your wrist, lets not go there). As your fingers curl around the conductor, that is the direction the magnetic fields are generated.

Likewise, if you want to find the force direction for a charge moving perpendicularly though a magnetic field, then shape your right hand like a gun but also point your middle finger perpendicular to your palm (I'll let you work out which side of the palm for yourself...). Now if you orient your index finger in the direction the particle is moving and your thumb parallel to the magnetic field, your middle finger will be pointing in the direction of the effective force. Don't really use that one much.

Another one I use once in a while is for figuring the force direction associated with rotation. Again, right hand, point your fingers in the direction of rotation as if you were going to wrap your hand around the rotating object (say for instance a car tire). Now your thumb will point in the direction of the tangential force. Classic Freshman physics demonstration is having somebody sit on a piano stool and hold a bicycle wheel on a short axis. Give the wheel a spin and if they hold it out in front, it will start to make them rotate ("precession" is the right word?) on the stool.

Seriously, it's all just a mater of finding the mnemnonic that works for you. There are LHR versions of most of the RHR tricks. In my case I tried to learn only the RHR versions otherwise I would have been too confused trying to keep track of which hand was for which! I have enough other things to keep straight without waving my hands about like a spastic spider monkey!

Having a nice summer down there?

Mike

Here is the artwork Harry mentioned. It is handy to print out and keep by your table.

Attached Images

Router direction.jpg (11.1 KB, 88 views)

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Mike
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woodnthings

Hey Guys, and especially beginners,
Give this a try, (I just safely did this myself, but do so at your own risk!)
Securely! clamp a 1"x3" wide board about 24" long to the edge of your bench parallel to the edge and 3" face side up. Get out your router with a bottom bearing and a roundover bit say 1/2" radius. With the router between you and the closest edge of the board,(near side) rout a 6" long pass from the right end of the board moving from right to left. Then from from the left end of the board rout a 6" pass from left to right. Notice the difference...it may be slight. In a straight, parallel grain board in my case, with an 18.5lb. PC 518 router there was very little difference. But that's a "monster router"!
Now put the router on the (far side) of the board, to simulate an "inside cut" and try routing the edge from left to right and then right to left. It's good to know what to expect in either case, because a condition will come up when you may need to do one or all 4 methods.

Cassandra

Hi Guys:

One technique I haven't seen listed above (maybe I missed it) is to use a permanent marker and put the correct direction on the router base. For freehand routing, when looking down on the router, the router should be going "clockwise" with respect to the side of the bit that is in contact with the workpiece.

For example, if one is routing a workpiece that is on the other side of the router from oneself, the router moves "clockwise", which would be left--to-right. If one is routing a workpiece that closer to oneself than the router bit, then "clockwise" would be right-to-left.

For table routing, the workpiece moves "clockwise" around the bit. If the workpiece is on the closer side of the bit, it moves right-to-left, which would be "clockwise" relative to the bit. If the workpiece is on the far side of the bit, then "clockwise" would be left-to-right.

HTH,
Cassandra