How to Make a Clean Hole with 1 1/8" Dill Bit?

[George C]

We've had great success this year starting with a centre drill, then 1/8 or so, then 1" (largest drill we have) then reaming to 1 1/8. As said previously, a 1 1/8 reamer has a very large shank and is very long. We cut it off just long enough so that when we chucked it up in a lathe with the teeth behind the chuck we didn't damage the teeth. We then turned the shank down to 1/2. We do as much of the reaming as possible in a vertical mill because it's more rigid, we can secure the work better and we can cut the rpm way down. Has worked really well.

[Andrew_V]

Perhaps hand reaming (with the proper undersized hole) would be applicable if powered isn't an option due to the large shank associated with large reamers. Basically tapping (so make sure its straight and because its reamer you don't need to back out to break chips )

(If you really have no other options adjustable hand reamers is an option albeit not the best option)

If you have a access to a mill a boring head and properly located hole would work too (but as the op stated just a drillpress)


Don't forget the lube

AndrewV

(edit quick google showed up a couple websites for a 1 1/8 reamer for around 50 - 70 dollars) (victornet, grizzly and amazon namely)

(heres a guide (reaming not included) http://www.micro-machine-shop.com/hole_drilling.htm)