Mainspring data thread

[IainMAD]

If you have a new spring that is overpowered do you

1. Cut some coils off and redress/polish the end

If so what is best method

Or

2. Heat end coils to red hot and compress them

If so how


Many thanks

[ToniD]

If you have a new spring that is overpowered do you

1. Cut some coils off and redress/polish the end

If so what is best method

Or

2. Heat end coils to red hot and compress them

If so how


Many thanks

Tinbum tuning do a short film on youtube.

Toni

[TonyL]

Yes, there are a few tutorials on line. Cut, take off any sharp edges, heat end coil to red, flatten, then dress the spring end so it's flat and smooth and de-burr inside of first coil or two.

[Dornfelderliebe]

Yes, there are a few tutorials on line. Cut, take off any sharp edges, heat end coil to red, flatten, then dress the spring end so it's flat and smooth and de-burr inside of first coil or two.

As Tony says but if I may add, a very small adjustment to power such as 1/2 a fpe can be made by heating and compressing a coil.
I asked about this a while ago and I was told shortening by 2mm would achieve 1/2 foot pound which proved correct.
You can either use a plumbers blow torch or a kitchen gas hob if the missus isn't looking and you can hold the other end while you're doing it.
Squeeze the coil with some snipe nosed pliers.
Cutting needs either a Dremel or an angle grinder and a vice.
You'd best ask others more knowledgeable than me about how much and you will need to cut and say exactly which spring and gun.

[TonyL]

Specification of TbT springs, as provided by Tinbum. Thanks, Nick:-

I have some specs:

TbT springs, shot peened and twice compressed; ie, delivered at working length

Premium

29 coil 3.1mm wire 14.2-3mm ID 225mm OAL

31 coil 3.1mm wire 14.2-3mm ID 235mm OAL

34 coil 3.1mm wire 14.2-3mm ID 265mm OAL

Premium Magnum

27 coil 3.6mm wire 14.1-2mm ID 208mm OAL

31 coil 3.6mm wire 14.1-2mm ID 240mm OAL

[TonyL]

Dimensions for the Welsh Willy Dagda HP spring, courtesy of brk1 (thank you) :-

Try one of welsh willys new HP Dagda springs, might well be close to your needs , may not be on his site yet ??? but are available , you'd have to talk to him, didn't realise you were in Oslo

Dimensions are as follows
34.5 coils
280 mm length
Wire Gauge 3.00 mm
O/D 19.60 +/- mm
I/D 13.6 mm

[TonyL]

Protek Supplies' current listing:-

http://www.proteksupplies.co.uk/mainsprings.html