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Pratt & Whitney 3C mill vertical head

markwesti

Aluminum
Joined
Apr 26, 2018
Location
Seal Beach , California
One is for sale on the bay . I posted earlier that I wanted one , this one looks a little strange to me not to mention it's not exactly a friendly price . On the other hand it's rare so who could say the seller is asking too much . I have never seen one of these , my question is , why are there threads and a keyway on the shank (that I thought would go into a collet) ? Also what is your opinion of this head ?
https://www.ebay.com/itm/176065059232?hash=item28fe4b99a0:g:3ZoAAOSw4EhlXTsu&amdata=enc:AQAIAAAA0CsfMi57hXh65+CB4+aUHsDQEIR0QBDjdZcdQ1cpmHgJ8ZwoirUpLcEaTl81DFnM07YP9K9Vps3uVqh2WhaXGCMG1RQShX655uRKKg9NNPs6Rg0poIU95umU82HieuNs4cPD7iBaDwmLlFpGxx8itrnrOaKsR3xDUXD1UC2Ccbqd5wHNbUDsH+TetyNfIdEzxB+OD4lT+HcEZYAFrhyekVko+6pQenssSHtZc/Nfwt5sY2kv5DHivOf8rxed4pQ8Qo5UoN3bhOAl7dGsv3SQNas=|tkp:Bk9SR-TpqJWKYw
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These are amazing devices. I cannot figure out how pratt whitney made these and sold them without losing a ton of money on each one. As mentioned the item that drives the head is a faux 5PN collet that fits into the horizontal spindle. You need two clamp wigits to hold it to the front of the machine, easy to make. Both of mine are home-made. The vertical head uses the same collets that fit into the horizontal spindle.
It's pretty universal, you can tilt it in two axes.
(yours shows the original drawbar, mine's home made)

pw_progress_15.jpg
 
One is for sale on the bay . I posted earlier that I wanted one , this one looks a little strange to me not to mention it's not exactly a friendly price . On the other hand it's rare so who could say the seller is asking too much . I have never seen one of these , my question is , why are there threads and a keyway on the shank (that I thought would go into a collet) ? Also what is your opinion of this head ?
https://www.ebay.com/itm/176065059232?hash=item28fe4b99a0:g:3ZoAAOSw4EhlXTsu&amdata=enc:AQAIAAAA0CsfMi57hXh65+CB4+aUHsDQEIR0QBDjdZcdQ1cpmHgJ8ZwoirUpLcEaTl81DFnM07YP9K9Vps3uVqh2WhaXGCMG1RQShX655uRKKg9NNPs6Rg0poIU95umU82HieuNs4cPD7iBaDwmLlFpGxx8itrnrOaKsR3xDUXD1UC2Ccbqd5wHNbUDsH+TetyNfIdEzxB+OD4lT+HcEZYAFrhyekVko+6pQenssSHtZc/Nfwt5sY2kv5DHivOf8rxed4pQ8Qo5UoN3bhOAl7dGsv3SQNas=|tkp:Bk9SR-TpqJWKYw
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I am the seller of this. I had the complete mill posted at 2k for a long time, trying to get what I have in it. Sadly, there were no serious takers, so I have decided to part it out.
 








 
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