3/16" Alpha Knife Supply Pivots?

Brian Avila

Brian Avila

Joined
Jan 2, 2011
Messages
1,286
So I am going to use alpha knife supply pivots. There isn't anything wrong with the ones that I purchased.

However, I used a 3/16" = 0.1875" reamer and I have to try pretty hard to get them to slip into my liner holes.

What reamer sizes do you guys use and is it suppose to be that hard? I don't think it is suppose to be.

-Brian-
 
I hear you count. Aks suggested a 0.1875 for their pivots. So maybe I did something wrong? Or maybe others have found a size that works perfectly?
 
Tight fit is good for pivot. To get best results get yourself a 3/16 lap with some 900 grit and pass it till it's where you want it. Keep in mind that the pivot will break in quickly so as long as you can slip it in without having to hammer it you should be ok.

I use 1/4" carbide reamer for the 1/4" aks pivots and get a nice fit right away.

Many places also sell undersize and oversize reamers so make sure you have an actual 3/16" reamer.
 
Yeah. I double checked the size. It is actual 3/16" = 0.1875".

I asked about lapping grit and I hear 400 is the usual. So that's what I purchased.
 
I've used a few of the AKS pivots in 3/16 size and a 3/16 reamer and they fit as they should. The pivot goes in and you can turn it. Frank
 
Also keep in mind your reamed hole size can very depending the drill bit used and how accurately the drill bit cut. The best fitting reamed holes come from first drilling then bore the hole then ream but thats really not need for folder pivot fit.

Brett
 
Brian Avila said:
So I am going to use alpha knife supply pivots. There isn't anything wrong with the ones that I purchased.

However, I used a 3/16" = 0.1875" reamer and I have to try pretty hard to get them to slip into my liner holes.

What reamer sizes do you guys use and is it suppose to be that hard? I don't think it is suppose to be.

-Brian-
Click to expand...
The shaft of the pivot is .1870"-.1872". There is a raised area next to the pivot head that is .1875"-.1877". The purpose of the raised area is to press fit into the liner and keep the pivot from rotating.

If you ream the blade and liners with a .1875" reamer, the blade will pivot with minimal play and the pivot will not rotate.

Here is a drawing of the pivot:

PS187B-Drawing-s.jpg
 
I like those pivots, and use them- .1875" reamed hole always works fine for me. Definitely a no slop fit, but not terribly hard to get the pivot through the liner. What are you using for liners, by the way?
 
I am using titanium. There isn't a problem. I was just curious if this is how they were suppose to work. It's tight but it works. So good enough for me.
 
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