I've been wanting a drop sear for quite a while, I missed the clean, crisp trigger of powder burners! A heavy spring in the Squirrel Whisperer and the PA cranked up was digging in on the stamped out cheap metal push sears, a few good shots after a clean-up and re-polish then back to the grinding trigger pull!
Being a poor man a 1701P frame wasn't practical...the sear and trigger link were. At just a few cents over $25 with shipping I had a pair of each. I'd been planning on doing this for a long time and finally got around to it. Two drop sear 13/22xx frames for less than one 1701P frame sounded good!!
(http://i1258.photobucket.com/albums/ii532/airriflenut/Various%20mods/1701PSEARANDLINK_zps3cf96536.jpg)
I honestly think the inside of my shop was colder than it was outside two days ago, the small heater just couldn't keep up. There wasn't a whole lot to the mod actually, just creating a place for a compression spring in front of the trigger link. A small piece of 6061 aluminum I had to mill down to 1/4" thick to fit inside the frame was the housing for the spring, this is just epoxied in place. I'm not sure if it's clearly visible, but on the front of the extension spring loop I cut two notches to hold the compression spring in place. My original idea was for a set screw in front of the spring to adjust the pull weight but the space available was less than thought...near frozen hands didn't allow for much head scratching "how am I gonna do this" time, my hands are in 24/7 pain anyway and the bitter cold wasn't helping.
The trigger is an original Crosman. It did the adjustable sear engagement mod a few years ago, I filed off the hump plus some and drilled and tapped 3-48. The engagement pad is a small piece of Delrin epoxied to a 3-48 set screw, it worked great on the old push sear, even better with the drop sear! The sear spring cup on an 8-32 rod was done a few years ago as well. With the Delrin plunger that goes with it it was easy to tune the trigger pull of the push sear, spring flex was totally eliminated. Now with the drop sear it serves equally well for sear return spring adjustment.
After shooting over 1/2 tin of CPUM between yesterday and today, the Squirrel Whisperer Jr. 2250 pistol will be done next, then my other 13/22xx frame!! A drop sear is SO much better to shoot, I wish I hadn't waited so long to do the mod.
Nice. :-*
I did the right thing asking you to make my shrouds---can't wait.
Joe
Quote from: Monkeydad1969 on March 02, 2015, 04:13:29 AM
Nice. :-*
I did the right thing asking you to make my shrouds---can't wait.
Joe
;) ;)
That is some great work Sterling. :-* I don't have the ability to do that work so it's 1-800-Cro$man for me.
That's some great re-engineering of the trigger group :-*
Glen
Very nice ... :-*
nice one sterling
ped
Thank you much Bill. GLen, Kevin and ped!!!
Now that is a very well done adaptation. Very nice.
Quote from: DavidS on March 02, 2015, 01:33:13 PM
Now that is a very well done adaptation. Very nice.
Thank you David!! I see you're fairly new to CAPOF, welcome to the BEST airgunning family!!
Sterling, did you even go to sleep at all last night? Don't make me move down there... ;)
Get some rest or no modding for you for the next 4 weeks. ;D
Quote from: Monkeydad1969 on March 02, 2015, 03:17:19 PM
Sterling, did you even go to sleep at all last night? Don't make me move down there... ;)
Get some rest or no modding for you for the next 4 weeks. ;D
Yes, I did get some sleep but not much and not restful. I'm waking up 3-4 times a night with agonizing hip/lower back pain...I need a pain management doctor and soon!!
Now Joe come on, do you honestly think if you came down here I would get more rest!? I'm thinking your guns would come with you and there would be more shooting done than resting. I've got a place for a 80cf 3k fill for just $5, and just maybe that WallyWorld will have some more $4 CPUM in stock!!
I AM ON MY WAY!!!!! :-*
Thats a slick setup. Very nice
That is some nice work as usual Sterling. :-* :-* :-*
Quote from: targettgii on March 04, 2015, 04:33:45 AM
That is some nice work as usual Sterling. :-* :-* :-*
Thank you Tom!!
I'm trying to understand how this new trigger group works. The old group works because when the trigger is pulled the sear rotates on its pin and releases the hammer. With the new group it appears that the trigger releases the link which releases the sear. What causes the sear to drop since the sear spring is on the wrong side of the pin? The sear spring looks like it holds the sear up in engagement. I hope this makes sense.
Quote from: hondo on March 05, 2015, 05:14:54 AM
I'm trying to understand how this new trigger group works. The old group works because when the trigger is pulled the sear rotates on its pin and releases the hammer. With the new group it appears that the trigger releases the link which releases the sear. What causes the sear to drop since the sear spring is on the wrong side of the pin? The sear spring looks like it holds the sear up in engagement. I hope this makes sense.
Detailed observation hondo!! In a nutshell: the face of the hammer has a bevel that engages the sear...push sear or drop sear. When the hammer (striker) is cocked there is sufficient force exerted on the sear that when the trigger is pulled and the link pivots the sear "drops" out of engagement...the gun fires. The spring under the sear is lighter than the normal push sear spring, it need only be strong enough to return the sear into battery after the firing sequence. All of that for this drop sear assembly, of course.
Having shot with the regular push sear for a long time I was used to it. With a drop sear the firing cycle is a LOT more defined and crisp. It just feels better to put it simply. With a drop sear (smoothed, polished, etc) more accurate shooting is possible due to the faster, more crisp sear release.
Thank you for the super quick reply.
In a nutshell, the striker/hammer pushes the sear out of the way when the trigger link releases the sear. No direct connection between the trigger and the sear. I can see how this results in a smoother trigger pull. In some drawings I've seen posted it appeared like the trigger links pin boss was not circular and forced the sear down when the trigger link rotated after releasing the sear.
Thanks again!!!!
Quote from: hondo on March 05, 2015, 05:53:33 AM
Thank you for the super quick reply.
In a nutshell, the striker/hammer pushes the sear out of the way when the trigger link releases the sear. No direct connection between the trigger and the sear. I can see how this results in a smoother trigger pull. In some drawings I've seen posted it appeared like the trigger links pin boss was not circular and forced the sear down when the trigger link rotated after releasing the sear.
Thanks again!!!!
Not a problem sir! And, I would like to welcome you to CAPOF!!!
Sterling,
When do you get your barrels?
Joe
Quote from: Monkeydad1969 on March 05, 2015, 06:49:21 AM
Sterling,
When do you get your barrels?
Joe
UPS shows for next Tuesday, 10th.