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Re: Crosman 1400 Pumpmaster 0.22"

Unread postPosted: Tue Jul 02, 2019 8:39 am
Author: hectmarr
Situation "desperate" that you comment, and the expulsion of the contraption to oppress the check valve, in emergencies, comical - risky. :) Lucky you did not have your face forward ... :roll:
Try to squeeze less, to get a balance between the fact that the piston is moving freely and the ring does not leave its position, I can not think of another idea ..
I think the machining of the components is excellent, I would say that it is like you have it in your head and after working hard, you are in the world outside the head. :D

Re: Crosman 1400 Pumpmaster 0.22"

Unread postPosted: Sat Jul 06, 2019 12:47 pm
Author: jackssmirkingrevenge
hectmarr wrote:I think the machining of the components is excellent, I would say that it is like you have it in your head and after working hard, you are in the world outside the head. :D


I literally could not have expressed it better myself :D

Having a bit of a rethink for this after blowing more seals than a lonely Arctic explorer, let's say we stick to the original "cup" design with a quad ring that seems to work.

It might be possible to reconfigure the cup in such a way that the outlet is much wider, while adding a balancing element to the cup itself as follows:

Image

edit: Drawing it to scale, it's a little tight...

Image

Perhaps this variation would work better:

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Re: Crosman 1400 Pumpmaster 0.22"

Unread postPosted: Sun Jul 07, 2019 1:36 pm
Author: hectmarr
I see that the ideas rain to solve the same problem, I know about this since it has also happened to me, with my designs. Sometimes, the "dizziness" is a bit vertiginous; heights, in any field of knowledge, produce vertigo to some extent.
This is to try and test ideas, it is the soul of all this, because once the problematic weapon shoots more or less as you want, the weapon is saved, to be fired from time to time, this allows us to remember that the problem was "defeated", this in each shot.
It seems a good solution, this variation that you drew, I say from my almost total inexperience in this type of designs, but it seems to me that the blessed - curse o'ring, is not going to bother. I follow your progress in this post that is a duet. regards :)