What is the cause of this ?

that's a router bit,and it loos like you have too much vibration.the bit is digging in.
 
Simple, the key word is THREAD-LIKE.
That means the cutter is past the starting point before one full revolution by the shaft.
X axis travel/feed rate is too high/fast for the revolution/spinning speed of the shaft.
 
exactly speed is too fast. slow it down legnth wise. although that would look awesome on a handle if it showed up under finish :grin: :grin-square: :grin:
 
dave sutton said:
exactly speed is too fast. slow it down legnth wise. although that would look awesome on a handle if it showed up under finish :grin: :grin-square: :grin:
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Looks like 15/16 6 TPI. :grin: :eek:
 
dave sutton said:
exactly speed is too fast. slow it down legnth wise. although that would look awesome on a handle if it showed up under finish :grin: :grin-square: :grin:
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Hummmm :rolleyes:

If it were more even that might be something nice.
At least it would be different.
 
WilleeCue said:
The thread like marks down this shaft is caused by what?
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It could be a dull Bit, to much traverse speed or too much turning speed. The dowel may not have been chucked up tight enough, which with the combination of the above speed factors and or a Dull Bit caused Vibration through out the dowel. Last, if none of the problems exist the chuck could be out of round / out of alinement with the foot stock, or you could have a bad Live Center. ;)
 
WilleeCue said:
Hummmm :rolleyes:

If it were more even that might be something nice.
At least it would be different.
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if you can find a way to control that it would be sick. a nice sugartree with that handle would be awesome. almost looks like quilted maple
 
dave sutton said:
if you can find a way to control that it would be sick. a nice sugartree with that handle would be awesome. almost looks like quilted maple
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Hey ... :eek: ... A nice WilleeCue with that handle would be awesome too.
 
I've had my share of those marks, my shaft speed was too high and the feedrate to fast. I now do about 150 rpm with 40 tpi for a feedrate, seemed to eliminate those marks. Also if the router speed is to fast, and the mount doesn't hold it securely, you may be getting resonance/ vibration from that also.
Dave
 
if you aren't getting vibration or resonance then speed rate of wood isn't the problem.i cut all mine spinning at 450 rpm and they are smooth.i don't think it's too high a feedrate either,it would look more like a striping effect.i think Craig may be right about it.
 
If it were due to vibration, you would probably see the effect primarily in the middle of the piece and not near the ends where the piece is more secured. I've seen this same pattern when tapering shafts on a table saw/lathe combo on humid days. Days before and after were dryer and cut was very smooth. Feed and rotation speeds were precisely controlled and consistent. It'll cut right out on next pass, so no problems unless you thought that was going to be the final pass . . .
Mr H
 
macguy said:
One thing that can cause that is too much pressure between centers.
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Looks to me it was cut too fast and it got faster the more the cutter got to the right ( ferrule end ) side.
 
WilleeCue said:
The thread like marks down this shaft is caused by what?
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I've seen that more times than I want to explain...

It has to do with a couple of variances.... either the router bit is dull or the timing between the revolutions of the spindle is too fast for the feed to catch up !!!!

you will have to play with it until you have a perfect cut......

In my personal experience, I find that the feed should be a 1/4 less "250rpm" than the spindle speed ...

I hope this helps !!!!!!




- Eddie Wheat
 
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I too have had something simular looking happen when cutting shafts. Even like that or like a barbershop pole. Slowing down my feed rates or setting My speed just right, usually helps solve the problem. It would look cool if it were the figure of the wood, and not from the cut.

Greg
 
WilleeCue said:
The thread like marks down this shaft is caused by what?
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Willee,
Cut your feed rate at least in half. Yeah, it's now going to take you twice as long but are you really in that much of a hurry? Patience is a virtue in cue building. It contributes to the therapeutic process. Speed in cue REPAIR is essential. Speed in CUE BUILDING is your enemy.

It's not resonance, if it were, you'd see 'chatter'. It's simply a matter of too fast of a feed rate & too small of a cutter bit. You're literally cutting threads. I'm guessing about 10 or 12 TPI. Left-hand to boot.

Question : Are you running your router towards the tail-stock or towards the chuck. Guessing again, from the pic, I'd say you're running towards the tail. Go the other way. On a machine tool lathe, ALWAYS work towards the chuck unless the job itself is prohibiting you from doing so.
 
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KJ Cues said:
Willee,
Cut your feed rate at least in half. Yeah, it's now going to take you twice as long but are really in that much of a hurry? Patience is a virtue in cue building. It contributes to the theraputic process. Speed in cue REPAIR is essential. Speed in CUE BUILDING is your enemy.

It's not resonance, if it were, you'd see 'chatter'. It's simply a matter of too fast of a feed rate & too small of a cutter bit. You're literally cutting threads. I'm guessing about 10 or 12 TPI. Left-hand to boot.

Question : Are you running your router towards the tail-stock or towards the chuck. Guessing again, from the pic, I'd say you're running towards the tail. Go the other way. On a machine tool lathe, ALWAYS work towards the chuck unless the job itself is prohibiting you from doing so.
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Why is everyone assuming this is Willie's shaft or he cut it?:D
I think he's just testing everyone.
 
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