Bullseye-L Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.

How do you tell the difference between mim and machined sears and hammers

Go down

How do you tell the difference between mim and machined sears and hammers Empty How do you tell the difference between mim and machined sears and hammers

Post by curmudgeon on Mon Apr 20, 2020 2:37 pm

I have a couple of dozen M-1911 sears and hammers collected over the years and I like to separate the mim parts from the machined steel parts. How do I tell the difference between the mim parts and the regular steel parts using simple kitchen table methods?


Many times over the years, I knew people who were going to tear-up Camp Perry only to have the triggers go bad on warm-up day.
I don't want this to happen to me. I want to sort out the mim parts which leads me to my second question. 
How do tell the bad mim parts from the good ones?  

I have new in package hammer that is labeled unbreakable. In over sixty years, I have only seem one hammer broken and it was a cast part.Are people taking liberty with the language?


I have more than one .45 and I have never had a sear or hammer wear out but one cannot be to carefull.


Joe  

curmudgeon

Posts : 5
Join date : 2015-06-25

Back to top Go down

How do you tell the difference between mim and machined sears and hammers Empty Re: How do you tell the difference between mim and machined sears and hammers

Post by mustachio on Mon Apr 20, 2020 2:58 pm

MIM parts will have casting lines on them where the two parts of the mold meet.
mustachio
mustachio

Posts : 164
Join date : 2019-04-05
Age : 71
Location : South Florida

Back to top Go down

How do you tell the difference between mim and machined sears and hammers Empty Re: How do you tell the difference between mim and machined sears and hammers

Post by Wobbley on Mon Apr 20, 2020 3:01 pm

MIM is actually a powder metal process where powdered metals are pushed into a die and then fused by almost melting.  It’s been used for years in the gun industry.  The only way to tell in many instances is to cut the part and do a metallurgical etching.  Or look very carefully at alll surfaces and see if you can find any “as sintered” surfaces, but you have to know what to look for.
Wobbley
Wobbley

Posts : 2853
Join date : 2015-02-13

Back to top Go down

How do you tell the difference between mim and machined sears and hammers Empty Re: How do you tell the difference between mim and machined sears and hammers

Post by jglenn21 on Mon Apr 20, 2020 3:02 pm

the dead giveaway for a MIM part is the small round impressions you'll see in them from the ejector pins.. cast parts have the lines normally

my favorite MIM picture. This was a Bul  part..  it lays on my workshop table as a reminder.

How do you tell the difference between mim and machined sears and hammers Broken10
jglenn21
jglenn21

Posts : 2115
Join date : 2015-04-07
Age : 72
Location : monroe , ga

Back to top Go down

How do you tell the difference between mim and machined sears and hammers Empty Re: How do you tell the difference between mim and machined sears and hammers

Post by curmudgeon on Tue Apr 21, 2020 1:28 pm

mustachio:  Parts with parting lines are cast.Quite common during WWII.


jglenn21: Thanks for the info. I found a few sears with the circles on the side. Where are the marks for a hammer located?
After thinking about this,I am led to believe that complex shape of hammer used with beavertail grip safeties are mim. I don't a easy way of machining them.


Sorry about the Bold lettering of the title, I don't know how that happened.


Joe  

curmudgeon

Posts : 5
Join date : 2015-06-25

Back to top Go down

How do you tell the difference between mim and machined sears and hammers Empty Re: How do you tell the difference between mim and machined sears and hammers

Post by jglenn21 on Tue Apr 21, 2020 4:25 pm

How do you tell the difference between mim and machined sears and hammers Hammer10

Mim Hammers
these are Wilson value hammers.. other Wilsons appear to be EDM cut parts
jglenn21
jglenn21

Posts : 2115
Join date : 2015-04-07
Age : 72
Location : monroe , ga

Back to top Go down

How do you tell the difference between mim and machined sears and hammers Empty Re: How do you tell the difference between mim and machined sears and hammers

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum