Drilling counterweight bore...

[WanderingEye]

Hi all,

I have an olde 5kg EQ6 counterweight, I want to use on another mount and the bore is too small, it needs to be 32mm, what is the best, cheapest or easiest way to drill it out, I have a good quality pillar drill...

thanks for looking.. 😀

[Dr_Ju_ju]

Depends on the max speed of the pillar drill, but I doubt it could drive a router bit, but there are stepped bits made for enlarging holes in metal, some cheap, others not, but have a look on amazon\ebay etc....

[johninderby]

Forget using a pillar drill. Needs to be done on a lathe so check with a local machine shop to see if it is worth it.

A big enough drill bit would be expensive plus would shake apart or burn out a typical home type pillar drill in a minute or two. You would need an large industrial sized pillar drill to drill a hole that size.

Edited December 4, 2019 by johninderby

[Davey-T]

I drilled a SW weight out to a bigger size using a good quality "Starrett" hole saw in my cheap  pillar drill, took a while but did it ok, needed to make a wooden guide to keep it central.

Dave

Edited December 4, 2019 by Davey-T