Author Topic: light strikes FTF- odyssey of a kadet  (Read 3094 times)

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Offline joerchi69

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light strikes FTF- odyssey of a kadet
« on: June 07, 2019, 09:05:11 AM »
Hello Kadets,

 just got the stove pipe theme solved with the help of this forums members by filing the angles to the ejector.
( https://czfirearms.us/index.php?topic=7863.90 ). No stovies anymore - and i tried different sorts of ammo. happy!
My not anymore german Club30 Berlin gunsmith where i bought the Kadet conversion kit in combination with the CZ SP-01 Shadow (1), failed to fix it twice, then finally blamed me for a false use of the handgun.

But my CZ kadet knows my interest in understanding an solving problems. So she now surprisingly offers me now lots of light strikes to dive into the further understanding of her complexity. And to keep me on reading in this superb forum. Wich is more effective than a Berlin weapons master shop.

For curing the stove pipes, before tuning the extractor, i recognised a movement in the extractor claw in the last moment when delivering the ammo going into the end of slot into firing position. It had contact with the slot and started pivoting out. So i deepend the slot as mentioned in the shares, a little by polishing bit by bit until the extractor fitted exactly into. The extractor claw is quite new and has a good grip of the brass rim.

The firing pin spring and the main/hammer spring is all original, so should clearly have the minimum force of the recomended 17 lbs, plus. And i always store the gun nicely cleaned after shooting it. Including breech face and checking the firing pin channel. The FP is moving freely in its channel. On the rails i use thin oil as adviced.

Using CCI Blazer i got lots of ignition fails. Like 25 on 100 yesterday. Also missfires with the standard CCI. The second strike mostly does it. But some of the ammo is not working at all : Thats how the not firing ammo looks like after 5 strikes, delaborated and then taking the pic of the case (it`s not the kadet magazin but a 1911, which the shell is leaned on ).

 Do you think it is a too light strike impact or an other issue ?


« Last Edit: August 18, 2019, 11:57:46 AM by joerchi69, Reason: width=950 »

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #1 on: June 07, 2019, 09:52:50 AM »
Extractor and breechface from above

and upside down




« Last Edit: September 15, 2019, 05:18:50 PM by joerchi69, Reason: width=900 »

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #2 on: June 07, 2019, 10:03:41 AM »
firing pin and spring


« Last Edit: August 18, 2019, 11:58:40 AM by joerchi69, Reason: width=950 »

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #3 on: June 07, 2019, 10:05:34 AM »
FP from other side

« Last Edit: August 18, 2019, 12:01:56 PM by joerchi69, Reason: width=950 »

Offline shootingsight

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Re: light strikes ? please comment pic
« Reply #4 on: June 07, 2019, 11:13:35 AM »
Tough to see in your picture, but look for bright shiny spots on the firing pin, indicating it is bumping on something.  partially hitting an edge somewhere can rob a lot of energy from the strike.

Also look at the face of the chamber.  If someone dry fired this gun without a cartridge, the firing pin might be impacting the edge of the chamber where the rim sits, preventing it from seating properly.


Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #5 on: June 09, 2019, 06:05:54 AM »
Tough to see in your picture, but look for bright shiny spots on the firing pin, indicating it is bumping on something.  partially hitting an edge somewhere can rob a lot of energy from the strike.

Also look at the face of the chamber.  If someone dry fired this gun without a cartridge, the firing pin might be impacting the edge of the chamber where the rim sits, preventing it from seating properly.

Hello,
thanks for giving your advices.
Now checked the FP for shiny spots but there are none. On the chamber no marks or hits. That brought me to check the maximum possible FP travel. Removed the spring and pressed the pin to take the picture. Seems just right - just cant hit the chamber:
 

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #6 on: July 15, 2019, 06:17:24 AM »
Thanks to this forums postings i found a lot of concrete examples to mostly bann the light strikes. I am using CCI sv. For testing i use other ammo too, like Blazer, if it runs with this (brass stronger ?), the gun works with the CCI sv anyway.
The last thing i did was adding a spacer under the hammer spring for a higher priming speed. That did the trick.Plus may be the other stuff i did aply before. The hight of the spacer is 2mm = 0,08 inch. As an first experiment. A little bit more an the hammer will not cock. But i will try to reduce it step by step. Because now i had failiures to feed and the slide did not always stayed open on the last round. Like one on fifty.
The other actions i took before where :

- made sure the slide travels fine
- cuting of windings of the firing pin spring (about 6)
- tryed to clean (maybe polish) the firing pin channel (with polish paste and a Q-tip in a power screwdriver)
- checked the firing pin on a straightening plate and on a lathe for straightness
- reduced the shoulders of the firing pin for more travel (just without touching the chamber)
- polished and smoothend the firing pin for gliding travel
- polished the firing pin spring
- cleaned the slot in the barrel for the extraction claw

Picture of the provisional spacer - blue plastic ring

 

« Last Edit: September 21, 2019, 04:11:49 AM by joerchi69 »

Offline joerchi69

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Re: light strikes
« Reply #7 on: July 15, 2019, 12:33:54 PM »
I reduced the spacer to 1,6mm = 0.629 inch. Testing and telling the results is possible in some weeks.
I received some spare parts for the CZ 75 and for the Kadet conversion kit. When checking the old modified firing pin (reduced the shoulders on the lathe) against the new FP (out of the box) i was surprised with the same measuring.The angle of photographing is not correct to read the measurement on the metric calliper. The width of the shoulders as shown in the pic is 3.25mm = 0.1279527559 on both FP`s.
You can also see a new original and the reduced length of the firing pin spring.

Offline adrian

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Re: light strikes ? please comment pic
« Reply #8 on: July 17, 2019, 01:51:06 PM »
     Hiya and thanks for your thread. It appears that you were able to troubleshoot your way to solving the issues with the Kadet kit. Glad that some of the forums old threads could point you in proper directions to look for issues. Enjoy and be well.

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #9 on: August 05, 2019, 07:38:52 AM »
Shot the kadet with the reduced spacer yesterday. I narrowed it from 2mm down to 1,6 mm.

With the 2mm spacer under the hammerspring where no light strikes or other issues with the cci standard (100 shots) but with theGECO ammo have been some issues. The cartride has not been loaded 2 out of 50 shots. And one light strike on 50. So i tryed the reduced spacer to 1,6mm but then the trouble started again even with the cci standard. On 40 shots i had 6 nobang. 1 of it the round was not delivered to the chamber. 1 time the slide stayed not open on the last shot. On the next 50 rounds where 3 light strikes and one failiure to load. All light strikes went of with the second try.
I think i have more research to do.

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #10 on: August 05, 2019, 07:53:17 AM »
Another small parcel of www.cz-spare.parts arrived.
I orderd some springs for testing. Also the original CZ75 hammerspring and a 16 lbs Shadow 1 spring.
It turned out that the hammerspring my CZ 75 SP-01 Pistol contained all the time is like that one classified for :
CZ 75 BCZ 75 SP-01 ShadowCZ 97 BCZ 97 BDCZ 75 TS ORANGECZ 75 TS CZECHMATECZ 75 TACTICAL SPORTSCZ 75 B OMEGA

https://www.cz-spare.parts/main-spring
edit:
"your question about the force of the spring 315817032002 .. in assembled condition 16,6 lbs and maximal operating 20,2 lbs."


« Last Edit: September 15, 2019, 05:14:54 PM by joerchi69 »

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #11 on: August 05, 2019, 07:56:29 AM »
For comparison i orderd the 16 lbs shadow hammer/main spring too. Built in the cocking is much weaker. It is longer but weaker. So i built in the other, stronger one again.
« Last Edit: September 15, 2019, 05:15:38 PM by joerchi69 »

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #12 on: August 05, 2019, 08:12:43 AM »
The new built in 16 lbs mainspring showed 1,8 lbs on average, measured imrovised as shown near the end of the possible travelway of the hammer.




 
« Last Edit: September 15, 2019, 05:16:55 PM by joerchi69 »

Offline joerchi69

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Re: light strikes ? please comment pic
« Reply #13 on: August 05, 2019, 08:21:35 AM »
The stronger spring has on average 2,7 lbs in the same position. Stronger, so i keep this. Much more than a 2mm (0,08 inch/ zoll)  spacer is in this case mechanically not possible. The compression of the spring is nearly completed when cocked. Keep on playing around with the width of the spacers and other components.
Maybe i try to get somewhere, the forum mentioned, even stronger Wolff springs for the CZ too.

« Last Edit: August 18, 2019, 12:07:18 PM by joerchi69 »

Offline joerchi69

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Re: light strikes FTF- odyssey of a kadet
« Reply #14 on: August 08, 2019, 12:52:48 PM »
With a spacer of 1.9 mm = 0.0748 inches under the 20lbs hammerspring, 135 CCI standard worked in the kadet without any malfunctions. Cleaned it. Shot some 9mm then went back to the Kadet upper. With Geco Semi-Auto then i had have 4 light strikes of a box of 50. All 4 went off on the second time with just cocking the hammer and firing again. With 30 no name ammo i had 4 light strikes wich also did it with the second strike. With all ammo today no failiures to feed and the slide stayed open on the last shot of the magazine.

Geco light strike: Impact not perpendicular on this case, will try a new FP retaining plate. Modified the current FP 1 to have the possibility to turn the FP 180 degree for an other hit area on the rim.

« Last Edit: September 21, 2019, 04:17:03 AM by joerchi69 »

 

anything