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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

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

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

Mike, I bet your skin around the wound had some yellow stains. When nitric acid reacts with soluble proteins it produces xanthoproteic acid, which is yellow in color. I took my chemistry labs in

"As a trained chemist I’ve needed to use con Nitric a bunch of times. You do have to be careful not to spill it on you because it promptly kills the nerves in your skin so you don’t notice it

No, the specific method I was talking about is for getting broken steel taps and drills out of ALUMINUM, not cast iron, like the bed of a minilathe. But maybe you could use acid anyway, which would

What percentage of nitric acid is required? I broke a M3x0.5 tap on my mini lathe doing a bed extension and could not get it out due to it breaking below the casting. I tried everything. I have time

Well I didn’t know the answer off the top of my head but Google does: "Although aluminium reacts with dilute nitric acid to produce aluminium nitrate and hydrogen gas, concentrated (>60%) nitric

The question was just technical. I’ve never needed to remove a tap. I would never use this method. But still, I wonder why the 66% concentration works where the more dilute does not. I’m