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Here is lowest-priced EDM machine.

It is on subject? about safely removing a tap. Nitric acid is not safe to use it can also damage your part. Sorry I know it not the answer you wanted. It would nice if they made a low cost EDM . Dave

Hi Mike, May I make a comment please: The original subject had nothing to do with the 7x12 mini-lathe group name. That said, since this off-topic wasn't criticized, I (and others) felt free to diverge

I'm sorry to see that in discussions this group doesn't ever seem to stay on the subject. This thread started with my posts using nitric acid lto remove taps and drills from aluminum. Then it drifted

The name of those is time serts. I used them back in the 70s and all through my career. I absolutely despised heli coils. george

Helicoils can let down like heads of engines. They do make a insert that is solid like allen set screw that works better. Dave

Helicoils are especially made for repairing threaded holes.

Here is photo . All had to do was wirer the transformer in 2009. If look close I used a left hand acme thread witch not need but had time. I also include a vibrator not need but had time . Dave

My situation was similar - 20 years ago - a small amount of milling in the mini-lathe. And I have to say my mill is, considering the price, only a little bit better. -- Lone Tree, Colorado? ?USA

Would like to see the recipe Dave.

Sorry for being a little off subject but this is a lot safer than Using nitric acid . I do not no of anyone use lathe has not broken a tap. I will dig out my edm and photograph it was made on a lathe

I uploaded more data on EDM machines. If all you building is just tap removal they simple . I have run a EDM for Automovie Machine? it was simple machine.? It like running a drill press not very

You can mix your own dielectric fluid . All the ingredients are found home. Some where have mix for low cost dielectric fluid Dave

I rarely use EDM, despite having a small commercial machine! It always takes longer to set up than it seems like it should + it makes a mess. There's always a lot of dielectric fluid that gets

20 years ago I had no mill so had to use my lathe and a Aloris tool post and holder it work great . If did a lot would done more by using use tool holder and plate bolt to holder. I found this that

Add information on EDM tap removal to /g/7x12MiniLathe/files/6%29%20EDM%20drawings

davesmith1800 <davesmith1@...> added folder */6) EDM drawings*

You have Automovie Machine Shop do the work. Most today are for machining but ato shops use the lower cost ones. You can build one for a microwave transformer.? Very low cost just for taps. I started

"*Re: Using nitric acid to remove broken taps or drills from aluminum* From: davesmith1800

Like Miket_NYC said?It is very dangerous to use. If see cooking shower what them use liquid nitrogen it too in dangerous. Nitric acid is more dangerous. Use a EDM machine if do not have got to your