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  #1  
Old 04-07-2018, 6:08 PM
mhswlee mhswlee is offline
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Default Polymer 80 (PF940CV1) trigger pins aligned, but not straight?

So I was drilling out the holes on my Polymer 80 (PF940CV1). Did it on a bench vise with a power drill, all six holes, each side independent of the other. Went smoothly. I brushed the plastic out and popped the pins in to test. They went in without a hitch.

Then I did a double take. All of the pins were aligned through and through, but they seemed crooked!



As you can see, the pins travel slightly rearward toward the right side of the receiver.

So, two questions:

1) Is there a problem here?
2) What should my next step be?
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Old 04-07-2018, 6:37 PM
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It's a Glock, so it'll likely work just fine. Assemble it and see for yourself. As long as they align with the rail insert, you should be fine.

Last edited by nick; 04-07-2018 at 6:39 PM..
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Old 04-07-2018, 11:14 PM
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Okay. I will finish the build and check. I am nervous because the holes on the right side seem to be 1mm too far to the rear compared to the left side.

Anyone else with an 80% receiver have a similar difference?

And if I do need to widen the hole, would it be hard to keep the pins from being worked loose?

Last edited by mhswlee; 04-07-2018 at 11:41 PM..
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Old 04-08-2018, 5:58 AM
shafferds shafferds is offline
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This is why you drill from one side all the way to the other side.
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Old 04-09-2018, 8:18 PM
Awesomesauce Awesomesauce is offline
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Quote:
Originally Posted by shafferds View Post
This is why you drill from one side all the way to the other side.
you would think that (makes total sense), but POLY80 explicitly states to NOT do that.

I concur with nick, see how it goes. If you drill more, that's polymer you can't put back in. The last thing you want are pins walking out.

Last edited by Awesomesauce; 04-09-2018 at 8:19 PM.. Reason: words
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Old 04-11-2018, 3:31 AM
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Quote:
Originally Posted by Awesomesauce View Post
you would think that (makes total sense), but POLY80 explicitly states to NOT do that.

I concur with nick, see how it goes. If you drill more, that's polymer you can't put back in. The last thing you want are pins walking out.
It's been my observation that drilling the hole all the way through in a single pass causes this kind of misalignment. Looking at the photo, that's what I'd have guessed to have been done.

In any event, nothing can be done at this point to remedy the situation, so continue with the assembly and see if the remaining parts fit and function properly. If so, then I'd see how (if) it shoots. Worst case, you have to scrap the frame and try again.
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Old 04-11-2018, 4:17 AM
tr6guns tr6guns is offline
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Yes If using a regular drill bit it has a tendency to wander. When drilling fire control holes I use a carbide spade bit of the right size..
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Old 04-11-2018, 4:21 AM
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That will cause a bind. You will need to compensate a little on each hole to make up differential.
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Old 04-11-2018, 5:41 AM
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Default Polymer 80 (PF940CV1) trigger pins aligned, but not straight?

If you think there was an issuing using their jig as directed you should contact their customer service. They’re pretty responsive.


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Last edited by olddirtygerm; 04-11-2018 at 7:13 AM..
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Old 04-11-2018, 3:04 PM
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I drilled all six holes independently, as instructed in the manual. It just ended up this way.

Anyhow, I removed the protrusions and inserted the locking block and pins. The top pin is fine, but the larger pin at the bottom is not. I think I need to widen the hole toward the rear. (The rearmost pin is also fine.)

Looking at the locking block itself, I think I'm okay? The pin seems to be working with the others to keep the locking block from moving vertically. My only concern is if the large pin can be worked loose if one side has a slightly longer hole.

Thoughts?

Last edited by mhswlee; 04-11-2018 at 3:07 PM..
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Old 04-12-2018, 1:09 AM
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It's not possible to make the hole any longer as the hole's length is limited by the width of the frame. The only thing you can do is make the hole larger - which will then eliminate any "tightness" that might hold the pin in place (at least on that side).

Since you followed the instructions (by drilling each hole individually), it's pretty clear that you have an out-of-spec jig. At this point, it's time to call the folks at Polymer80 and tell them of your discovery. I feel pretty certain that they're going to want to get a look at your jig's problem - since the holes are clearly not positioned opposite each other as they were intended to be.

In any event, you need to call the Polymer80 folks since we (us forum members) can say what we think all day long, but a new frame is all that's going to fix that problem. The only alternative is to see if it works the way it is, but I suspect the trigger will probably bind or be far less than ideal if it actually runs.
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Old 04-12-2018, 8:06 PM
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Alright thanks. I will get in touch with them right away.
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Old 04-12-2018, 10:53 PM
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Quote:
Originally Posted by Awesomesauce View Post
you would think that (makes total sense), but POLY80 explicitly states to NOT do that.
Sounds like they are idiots then.
Nothing good comes from drilling a pair of collimated holes from two different starting points.
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Old 04-13-2018, 7:56 AM
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The other problem is that the jig isn't very robust to begin with, so even if it wasn't clamped into the vise with extreme pressure, it still could have warped slightly.
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Old 04-16-2018, 10:38 AM
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Quote:
Originally Posted by tr6guns View Post
Yes If using a regular drill bit it has a tendency to wander. When drilling fire control holes I use a carbide spade bit of the right size..
Do you have more information on the appropriate type of spade bit?
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Old 04-16-2018, 5:57 PM
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Quote:
Originally Posted by FreshTapCoke View Post
Do you have more information on the appropriate type of spade bit?
I'm sure he means die sinking spade bits.
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Old 04-17-2018, 6:01 AM
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Yep, Actually they are called Straight Flute (Must be getting old) Here is the place I get them..

https://www.mscdirect.com/browse/tn/...navid=12106212
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Old 04-17-2018, 10:51 PM
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Quote:
Originally Posted by tr6guns View Post
Yep, Actually they are called Straight Flute (Must be getting old) Here is the place I get them..

https://www.mscdirect.com/browse/tn/...navid=12106212
You use those in a Makita right?
You only need one hand on the cordless drill so you can hold your beer with the other hand...
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Old 04-18-2018, 6:08 AM
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Naw, its a Dam Grizzly but it still leaves one hand free for the BEER.
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Old 04-18-2018, 10:11 AM
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Naw, its a Dam Grizzly but it still leaves one hand free for the BEER.
Some people might not understand the inherent spindle rigidity requirements of using carbide tools...
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  #21  
Old 04-18-2018, 2:48 PM
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I found that out Many Years ago, and at 77 I'm still learning
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