+- MetalworkingFun Forum (http://www.metalworkingfun.com)
+-- Forum: Machinery (http://www.metalworkingfun.com/forum-10.html)
+--- Forum: Milling Machines (http://www.metalworkingfun.com/forum-12.html)
+--- Thread: I need to make a small repair on my Franken Mill (/thread-2458.html)
I need to make a small repair on my Franken Mill - mike-sid - 01-17-2015
I made a cut today and decided my mill's head was out of tram. No big deal...wrong. When I tried to loosen up the ram that holds my head, one of the levers just kept spinning. Here is the result.
![[Image: Frakenmillrepair1022_zpsc4784664.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/Frakenmillrepair1022_zpsc4784664.jpg.html)
![[Image: Frakenmillrepair1020_zps229ea9ee.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/Frakenmillrepair1020_zps229ea9ee.jpg.html)
![[Image: Frakenmillrepair1005_zps7c29e8ab.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/Frakenmillrepair1005_zps7c29e8ab.jpg.html)
The shaft is threaded 3/8" x 24 tpi and is attached to the lever with a pin. The pin was sheared off and the screw shaft is bent at the top. Thinking back to the last time I adjusted the head, I noticed something was wrong but I had the head trued up and left it like that. Thinking way back, I think the shaft was bent getting it into my shop.
Time to get busy. Forgot to mention that I'm making a new shaft.
RE: I need to make a small repair on my Franken Mill - PixMan - 01-17-2015
Are you tooled up for threading the 3/8-24?
I don't recall if you and I ever went over the subject of threading tools.
RE: I need to make a small repair on my Franken Mill - mike-sid - 01-17-2015
We did go over it one time when we meet up for a beer. I have the Kennametal LSASR- 83 tool holder and I think you call it a "full forming" insert. I have a 16 ER 24 UNJ insert on hand. Does that sound right? I'm not so sure about the insert?
RE: I need to make a small repair on my Franken Mill - the penguin - 01-18-2015
Wouldn't be easier to just use a piece of hardened 3/8"-24, B-7 All-thread and pin the handle to it?
Would like me to send you a couple of pieces?
RE: I need to make a small repair on my Franken Mill - mike-sid - 01-18-2015
(01-18-2015, 11:03 AM)the penguin Wrote: Wouldn't be easier to just use a piece of hardened 3/8"-24, B-7 All-thread and pin the handle to it?
Would like me to send you a couple of pieces?
Thank you for the offer! But I want to make it myself. I need the practice. It is a very low tolerance part...even I can't mess it up as hard as I try
RE: I need to make a small repair on my Franken Mill - Sunset Machine - 01-19-2015
Looks simple enough, but what about the bottom half of the cotter? Those threads on the shaft looks pretty well trashed, the female component likely is too. Drill/tap it out to the next larger size?
RE: I need to make a small repair on my Franken Mill - PixMan - 01-19-2015
I'd be surprised if the threads are trashed because they stay threaded together unless you're taking it completely apart. It's probably just the rust making them look a little dodgy.
If the threads are junk I'd make all new parts! More work, but more fun and gratifying to do.
RE: I need to make a small repair on my Franken Mill - mike-sid - 01-19-2015
PixMan is correct. The threads are ok, the picture is not in the best of focus and the rust came out looking 10x worse than it is.
RE: I need to make a small repair on my Franken Mill - mike-sid - 01-24-2015
My first attempt did not go well, but I learned not to take shortcuts even on easy work. I turned down a .5" bar without supporting the other end. The first piece came out looking like wavy gravy
. I threaded the part for practice. Here are some pictures of the first attempt. ![[Image: 20150118_182514_zpsoktonra6.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/20150118_182514_zpsoktonra6.jpg.html)
![[Image: 20150123_102428_zps1lizzdz3.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/20150123_102428_zps1lizzdz3.jpg.html)
On the second try I used a live center. This worked great, nice finish and it cut nice and true. Here are a few pictures of the set up and part before and after threading. I know some of you guys did this kind of work in high school, but I bought the lathe and Franken Mill and I'm learning as I go. I might add that I meet up with PixMan a couple of times and he showed me a lot. As a novice watching him set up and thread a new lead screw for my cross slide was truly inspirational.
![[Image: 20150123_102552_zpssnph4gdl.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/20150123_102552_zpssnph4gdl.jpg.html)
![[Image: 20150123_111306_zpstflpj3ag.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/20150123_111306_zpstflpj3ag.jpg.html)
![[Image: 20150123_111311_zpsvluyrkrt.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/20150123_111311_zpsvluyrkrt.jpg.html)
I still need to drill for the pin
![[Image: 20150123_223211_zpsou0ukhml.jpg]](http://s204.photobucket.com/user/mike-sid/media/Fraken%20mill%20repair/20150123_223211_zpsou0ukhml.jpg.html)
RE: I need to make a small repair on my Franken Mill - DaveH - 01-24-2015
Nicely done Mike
Looks good.
DaveH