Reply With QuoteYou wouldn't get much compression with gaps like that. I think you need to be looking in microns.Originally Posted by Risen
Sory, can't help.
Ray
Registered User
Does anyone know the piston diameter at the rea of a tx200 piston, the bit that runs in the main body/.
How much space is there between the piston and the main tube 1mil,2mil?.
Ta
Ris
Banned
You wouldn't get much compression with gaps like that. I think you need to be looking in microns.
Sory, can't help.
Ray
Banned
Think he means the compression tube that the piston runs in.
Sorry I don't know. Were you thinking of fitting buttons?
ATB
Ray.
waste of money on a tx anyway. the delrin bushes are there already on the piston but the compression tube only needs a polishing to get it smoother.
Registered User
sorry no i mean the back of the piston and the main part of the action.
Ris
Banned
Buttoning can make the cocking cycle a bit smoother and is better than polishing as you still have metal to metal contact with polishing.
Very easy to do now with the Maccari buttons
I understand the new Pro-Sport has buttons on the compression cylinder to smooth the cocking action.
ATB
Ray.
Banned
The back end of the piston has a delrin ring fitted which runs as a sliding fit within the compression tube. I don't know what the clearance "gap" is without the ring.
Sorry.
ATB
Ray.
Registered User
No worries i was just wondering
Ris
Registered User
Risen,
My TX200 Mk 2 is apart at the minute so I have just run the vernier across a few bits. Answers are....
-Inside diameter of action 30.0 mm
-Stepped outside diameter of piston 29.0 mm
-Diameter across the outside of the plastic ring 29.8 mm
Also for reference.
-Outside diameter of piston 24.5 mm (between seal and stepped diameter).
-Compression tube inside diameter 25 mm (not measured but that's what it is).
So notionally 1.0 mm clearance on diameter. Bit disappointing that the plastic sleeve is 0.2mm clearance, ought to be better than that really.
BMP01
Registered User
Byron- If its still apart what does the piston and top hat weigh?
Also what is the stroke? (I think you have the shorter stroke MK 1 is that the case)
cheers,
Nic
Registered User
thnx m8, is it just me or are the tolerances getting a bit looser?.
Ris
Registered User
Forgeron,
I weighed some parts a little while back.
-Piston Assy incl. seal is approx 209g
-Piston weight is approx 28g
-Piston stroke is approx 82 mm.
My TX is Mk2, I understand Mk 1 and Mk 2 are "short" stroke. Also worth mentioning, its 0.177. These are fitted with the heavy piston weight as std (also adds 13.2 mm of spring compression). I understand the 0.22 version has a smaller piston weight and presumably this adds less spring compression. In any event I've seen several recommendations of removing the weight to smooth the firing cycle. I did this and it did improve things. Hope all this data you are collecting is being compiled into a useful database
Risen,
No problem. This is my first TX so afraid I can't pass comment on tolerances getting worse. This one was manufactured in Feb '99 according to AA so obviously been a bit baggy for a while. I'd like to make some new plastic rings to tighten things up a bit - 3 point contact instead of full circle would allow it to be tighter but the ring runs over the cocking slot so that's not an option.
BMP01
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