I bought this 1/4" shank to 8mm shank for AUD19.67 (about USD13.50)
because ER11 spindle can only take max of 7mm and a lot of stuffs like cheap drag knives and burnishing toois which always comes in 8mm aluminum tubes/rods (no need to power on the spindle for cutting vinyl or making cardboard boxes on a CNC router).
What is the pleasant surprise?
Most collets I already have for my Rt0700C clone trimmer router from 1/8", 6mm. 1/4", 8mm fits this collet extension perfectly too.
CNC router has advantages.
I had these (Made in USA) HSS router bits and countersunk drills bits which I had not used for over 30years because I only had 1/2" routers and was told these are UNSAFE to use.
They will work WELL on any CNC router with extension collet with no safety issues.
Happy new year using some antique router & drill bits.
Sorry for posting on the General Router sub-forum instead of the CNC Router sub-forum.
Although the reason I bought it was for use on the CNC spindle, I plan to used instead on the horizontal + std router table I am building instead. It is just a chuck extension for a 1/4" router.
The ER11 spindle on my CNC router is limited to 7mm. But I am aware of machine shops in USA making CUSTOM 5/16" collets for ER11 chuck (for >USD100) and factories in China making non-standard 8mm collet for ER11 for about USD12
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