sleepysquirrel2
Member
- Joined
- Dec 17, 2020
- Messages
- 42
How much wobble is acceptable for a trapdoor when the breech block is closed?
I recently won an 1884 trapdoor in an auction, so I couldn't inspect in person.
When closed, there is a minor side-to-side wiggle ("yaw"). It's hard to measure (about less than 1mm or 0.040"), but you can rock the rear of breech block side to side and hear it "click" from the wiggle room. There is no forward-aft wiggle, nor any up or down wiggle.
When opened, there is a decent amount of side-to-side wobble on the hinge. I have read that looseness with the breechblock open is fine, because the hinge pin does not bear any load, and it is the cam latch that bears all the force of firing.
If I remove the breech block and examine the cam latch, the cam pin has a decent amount of angular play in the attachment in the breech block. Is this what is causing the looseness at lockup? And if I replace the cam latch ($50 part) will this fix the looseness?
I recently won an 1884 trapdoor in an auction, so I couldn't inspect in person.
When closed, there is a minor side-to-side wiggle ("yaw"). It's hard to measure (about less than 1mm or 0.040"), but you can rock the rear of breech block side to side and hear it "click" from the wiggle room. There is no forward-aft wiggle, nor any up or down wiggle.
When opened, there is a decent amount of side-to-side wobble on the hinge. I have read that looseness with the breechblock open is fine, because the hinge pin does not bear any load, and it is the cam latch that bears all the force of firing.
If I remove the breech block and examine the cam latch, the cam pin has a decent amount of angular play in the attachment in the breech block. Is this what is causing the looseness at lockup? And if I replace the cam latch ($50 part) will this fix the looseness?
