TX200 HC power reduction?

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Sake-san
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Re: TX200 HC power reduction?

Thu Jun 02, 2016 6:14 pm

Looking into it with a torch should tell you, a generous squirt of degreaser will help to loosen the grip of old compacted grease etc.
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Bosun
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Re: TX200 HC power reduction?

Fri Jun 03, 2016 12:04 pm

finners wrote:Bosun,

You have checked that there are no 'spacing washers' at the base of the piston...? They are sometimes there, but are difficult to get out. Invert the piston and give a few sharp bangs of the latch rod end onto a piece of wood, so's not to damage the latch rod. It is very unusual for a standard spring to be producing 11.8 ft.lbs.

Finners.


Many thanks. I'll take a look there first. On previous AA springers, the pre-load washers have always been on the spring guide rod.
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Bosun
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Re: TX200 HC power reduction?

Tue Jun 07, 2016 9:46 pm

Mmmm....... No washers in the piston, so I think I'll give "collapsing a coil" a try. I watched the videos and it seems pretty straightforward. However, there was no mention of re-tempering. OK, the collapsed coils will be fine, but what about the adjacent live coils?
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neil180
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Re: TX200 HC power reduction?

Fri Jun 10, 2016 5:02 pm

Dont worry about re tempering. Just heat up the end coil that you want to collapse. Collapse it and let it cool down in air. Job done.

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Sake-san
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Re: TX200 HC power reduction?

Fri Jun 10, 2016 6:11 pm

Just to add, you probably know anyway but, do it at the front (muzzle) end of the spring, less stress there.
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Bosun
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Re: TX200 HC power reduction?

Sat Jun 11, 2016 6:42 am

Sake-san wrote:Just to add, you probably know anyway but, do it at the front (muzzle) end of the spring, less stress there.


Thanks for that. No I didn't know. But why should there be less stress at one end than the other?
Air Arms ProSport 0.177 Walnut, MTC Mamba Lite 3-12x44
Air Arms TX200 HC 0.177 Walnut, MTC Mamba Lite 3-12x44
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Sake-san
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Re: TX200 HC power reduction?

Sat Jun 11, 2016 8:48 am

I know not the technicalities but, it was advice passed to me by two of the UK's pre-eminent tuners ;)
Gary Martin understands engineering stuff, perhaps he will have an answer?
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gary martin
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Re: TX200 HC power reduction?

Sat Jun 11, 2016 8:08 pm

springs tend to fail at the rearmost coils. greater stress at this end. when trigger is released, the coils at the piston end open/destress first, then the coils behind start the process. the rear of the spring is forced toward rear guide, opposite/ reaction to the piston being forced forward. piston also trying to move forward whilst hitting compressed air, sending forces rearward, rear of spring gets a harder time due the the lag in coils opening whilst forces coming back up the spring when they are trying to destress/open.

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