Would you not be better off holding the drill on the other side ? so the belt is running in the opposite direction to the spin of the drill ,be a lot quicker . And this isn't very precise is it ,can you not use a Lathe ?
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Is Ws77 gouse yard friendly, or is it crazy loud . Please help cos im thinking, too, buy Weihrauch 95 or 77, but i love the design of 77. Thank you very much. Best regards from Croatia
The std hull cartridge hw80 is 3mm .. the west German version is 4.2mm std The venoms usually are 5mm the bigger bore and correct spring and turning gets the pellet to the barrel end just as the piston slams the wall .. Going from 3-4mm will increase power massively and reduce recoil not really a bad thing if your cutting down the spring
Just wondering if the trajectory would be a problem at range , plus I thought the piston seal does not spin being the piston travels in a straight line , that will have some hitting power 🥂 Cheers
Please let me know whether reducing the TP increase power or reduce power.. I need more power of my gamo big cat so it's important for me to know this bro ..
It's generally best to leave it alone. The temptation is to make it larger seeking more power, but for a spring rifle what you want is efficient transfer of energy from the spring to the pellet and for it to happen smoothly. If you open up the port you can increase the slam effect of the piston causing a more violent forward recoil which is a bad thing. For a given rifle and pellet combination there will be an optimum diameter for the port which depends on many factors. My understanding is the manufacturers have already determined what size TP works best in general and little if any performance will be gained by altering the port. If too much material is removed it makes the gun worse not better, and as you can see it's not that easy to reduce the size after you drill it too big.
if a transfer port is kept small by the maker to get it legal in certain country`s , you could open it up to the fac model. but a larger hole will result in a cooler air because of the lower compression and then you less gas volume
I did the piston head mod on my 77 some years ago (the 25mm piston). Unfortunately, the swept volume was reduced to such a degree that 11 ft lbs could not then be achieved, even trying several different springs.
The problem with the HW77 pistion is that you have a catch that only works in one plane to latch on the trigger sear/catch. On the original HW80 piston the cocking shoe keeps the piston oriented correctly. That's why the Walther LGV piston is used as it's latch is round and can be used in any orientation.
I think I have some ideas re piston developments contact with CNC plastics manufacturing would love your help building my competition gun and putting together a design we can push out via this other guy as combined high tech plastics and steel kit. Self fit. Skeleton piston...
You know what, I do agree with what your saying about the plastic band on the skirt I've looked at them and considered myself that as they slide along in the cylinder the atmospheric air has to move around and out of the way. Might seem like nothing but even air is probably more like the viscosity of tar when pistons are getting forced through it at speed.
I watched the first quarter or so of this video with great interest, as I have the opportunity to buy an HW77K in .25 calibre. I love the gun, but I have no use for anything in .25. I can't use it for HFT, and in South Africa, I'd need to licence it as a conventional firearm. From start to finish, a complete PITA. BUT, I also have a choked Lothar Walther barrel in .177 which I can machine and re-blue - and you can probably see where my mind is going. :) This video was the confirmation I needed that it can be done. Thanks for that!
my hw77k .177 has a tbt kit in with a medium power spring its got 2 preload washers on with 1 slip washer and it shoots without recoil and is at 11.5 ftlbs .
