3/8" x 10" Forstner Bit Extension
Forstner bit extensions solve one of the major problems with forstner Bits -- their limited depth capacity. This extension fits WoodRiver forstner bits only that have 3/8" diameter shanks.Features:...
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• Designed for use with WoodRiver forstner bits only
• Extension adds 10” to length of forstner bit
• Socket accepts forstner bits with 3/8” diameter shanks
• Forstner bit held in extension socket with two set screws
• 3/8” diameter drive shank allows use of multiple extensions
First time used, it snapped
Used to core pepper mill.. The shaft snapped within the first five seconds of use drilling a pepper mill blank.
Forstner Bit Extension exceded expectat
Well made Quality product
I use this to extend my forstner bits while boring pepper grinders. I have found that this model has the best retention screws to hold bits in place.
Excellent bit extension.
Helds the bit straight and true.
Works well with Woodriver 10pc bit set.
Use with Woodriver 10pc bit set for woodturning bores. Seems very true and holds bits securely.
Works with any forstner bit
Even though the two set screws were very tight, my 1.5" forstner bit started slipping. Then I remembered reading a suggestion to slightly flatten one side of the round shaft on a grinder. This gave the set screws someplace to grab and the slipping was eliminated. Recommend to not get too agressive with large bits to avoid twisting the shaft and snapping it.
Not what it is cracked up to be
I don't like it. It wobbles too much when drilling thru holes. I made a better one from 3/8" id steel tubing by drilling two wholes and tapping for 2 allen screws. Works really well. I have made two for half the price of this one. (1) 5" and (1) 10"
when out toward the 3 0r 4 inch range starts to wobble and wander of center. needs to be a little beefyer in the shaft. but you get what you pay for
All that I expected
Use it for hollowing peppermills, lamps, and other long turned items.
Forstner bit extensions 1st rate
allows for deeper drilling of weed pots
I'm a Happy Borer
I don't know about all Forstner bits, but my set has a cylindrical shaft, which is difficult to grip. I simply ground a bevel on one side for the Allen screws to contact and there is no slippage even at the end of a long bore.