end mill slipping

[mwestvang]

I have a ShopSabre router with collets. More often then I like I get slippage on an endmill and it backs out and ruins the work.

What's the solution to this irritating and expensive problem.

Mike

[ger21]

Tighten them more?

If it uses ER collets, get a torque wrench to tighten them correctly. They're expensive, though.

[sinha_nsit]

C-spanners are also used.
And you cannot dig using an endmill unless these are full bottom cutting type (I forgot the exact technical term).

[christinandavid]

...you cannot dig using an endmill... (I forgot the exact technical term).

Er....drill?

I think maybe the problem in this instance is maybe too much digging in is going on...

Always use the correct length wrench and hand tight should be good enough for any reasonable application. Refrain from overtightening as this will distort the collet and crack the clamp nut/holder, resulting in more of the same.

If your collets/holders look a bit poorly, try some new, un-abused ones. Use the correct size collet for a snug fit on the shank. If all else fails use an alternative clamping method (sidelock, screw-shank) or back off a bit on your cutting parameters.

DP

[leggazoid]

Don't let the bit bottom out, always pull it out some before you tighten the collet. This will give the collet room to draw the tool back as it tightens all the way.

[Butterknife]

leggazoid Don't let the bit bottom out, always pull it out some before you tighten the collet. This will give the collet room to draw the tool back as it tightens all the way.

I second your thought leggazoid. A time or two of tightening the tool up with the bit bottomed out and you've ruined the collet, because collet tries to push the tool deeper and since the tool is already bottomed, it has to slip on the tool shank.