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Glad you got them out! A thread chaser is to be preferred to a tap for cleaning up threads although if using a tap, a bottoming tap is the choice.
A tap is designed to cut away material which lies between the threads which means that chasing with a tap will cut away some or all of the metal which has been displaced.
A thread chaser is intended to realign and reform displaced metal which means that some or all of the displaced material will be forced back into threads. In a badly damaged thread, the chaser may save the day while the tap can remove too much material.
Another advantage is that a thread chaser is less brittle and so less likely to snap off in the hole. An additional advantage is that a thread chaser has little in the way of flutes so there is less opportunity for loose material to wedge and jam the tool.
Hansen and most professional tool lines have thread chasers. Here's a photo of one: http://www.mactools.com/ShopOnline/P...9/Default.aspx
Of course, you require metric but this is the style to which I was referring.
For crossed spark plug thread restoration it is difficult to beat Mac Tools expanding restoring tools which fit into the good threads at the bottom of the hole and move upwards, ironing out the damaged threads. These require that one starts with a loose fit and takes several passes with each a bit more expansion on the tool but they are super! I use my set from time to time to bail people out of difficult situations: http://www.mactools.com/ShopOnline/P...1/Default.aspx
A tap is designed to cut away material which lies between the threads which means that chasing with a tap will cut away some or all of the metal which has been displaced.
A thread chaser is intended to realign and reform displaced metal which means that some or all of the displaced material will be forced back into threads. In a badly damaged thread, the chaser may save the day while the tap can remove too much material.
Another advantage is that a thread chaser is less brittle and so less likely to snap off in the hole. An additional advantage is that a thread chaser has little in the way of flutes so there is less opportunity for loose material to wedge and jam the tool.
Hansen and most professional tool lines have thread chasers. Here's a photo of one: http://www.mactools.com/ShopOnline/P...9/Default.aspx
Of course, you require metric but this is the style to which I was referring.
For crossed spark plug thread restoration it is difficult to beat Mac Tools expanding restoring tools which fit into the good threads at the bottom of the hole and move upwards, ironing out the damaged threads. These require that one starts with a loose fit and takes several passes with each a bit more expansion on the tool but they are super! I use my set from time to time to bail people out of difficult situations: http://www.mactools.com/ShopOnline/P...1/Default.aspx
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