[Clueless&Luke]

I've been looking into the ER20 Extension chuck can be found here on Amazon https://www.amazon.co.uk/gp/product/B07V8HMF3W/ref=ox_sc_act_title_4?smid=A2MLCRXSIFIWIA&psc=1


If I bought this I could use endmills in my router.


So I was just wondering if there would be any Cons in upgrading my chuck

 

[ger21]

Any runout in the collet will be magnified the further the chuck sticks out, which may cause some vibration, depending on how accurate your collet is. Other than that, no issues.

 

[RainMan 2.0]

Would a muscle chuck give you appropriate length ? You’d also have a quick change system at the same time

https://www.rockler.com/quick-change-musclechucktrade-musclechuck

 

[Herb Stoops]

This looks like the American Equivalent :
https://www.amazon.com/Wolfride-Rou...r+collet+1+2&qid=1565457621&s=gateway&sr=8-11

A tad cheaper than the Musclenut.
Herb

 

[RainMan 2.0]

This looks like the American Equivalent :
https://www.amazon.com/Wolfride-Rou...r+collet+1+2&qid=1565457621&s=gateway&sr=8-11

A tad cheaper than the Musclenut.
Herb

That was my concern also . Big price difference, but it gives you the easy change option

 

[ger21]

The ER collet gives you unlimited choice of shank sizes. Which I think is what the OP was looking for.

 

[MEBCWD]

I would caution against using the 1/4" shank version. That is a lot of weight added and any runout would be a lot of sideways force against that 1/4" shaft. Add to that the weight of the bit and it's added extension form the collet.

 

[ger21]

Yes, definitely do not try one with a 1/4" shank. I didn't even know they made those.