Tuning Question?



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Offline SpiralGroove

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Tuning Question?
« on: January 09, 2019, 10:05:41 PM »
First of all, I'd like to praise all the great airgun tuners we have here at the GTA.
Motorhead, Travis and Rocker ......... are fantastic choices.

My question involves working on a piston.  Can a piston be slotted aka R10 via a drillpress or does it require a mill.  I could use carbide drills on the drill press and finish off with a Dremel or is a mill the only choice?

Put in this situation as I ordered a HW85 piston (for my R10) from chambers as it was a different stock # than the HW95's.  Unfortunately, got a HW95 piston anyway, with no slot.  Not even sure the thing will fit my R10 as I haven't opened her back up yet.
Assuming the piston fits, which is the best way to create a slot per above?

Thanks,
Kirk
  • Bothell, WA
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347
BSA R10 (.177), BSA R10 (.22)
Beeman R10 (.177) or (.20)
Diana Stormrider (.177)
HW30S  (.177), HW30S (.177)
HW35ES (.177), HW35E (.177)
HW50SS (.177), HW50S (.177)
HW77K (.177), HW80 (.20)
HW95 Hybrid (.177)
QB78D (.177), QB78DHPA (.22)
QB79HPA (.177), QB79HPA (.22)

Selling:
- BAM B50 .177 caliber
- Hatsan AT44 -10 .177 caliber - exc. condition
- Diana Stormrider .177 New, except sm. stock chip
- 2 -> .22 caliber HW barrels w/CL: HW30 & HW35
- 2 -> HW50S Stocks - Both in excellent condition.

Offline Motorhead

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Re: Tuning Question?
« Reply #1 on: January 09, 2019, 11:54:31 PM »
The longitudinal stability required to run an end mill in full plunge mode down a length of steel tubing takes a MILL.
It is going to chatter SO BADLY that unless the vise holding it and carriage that makes it move is VERY SOLID as well the head stock of the Mill / Drill robust it can turn into a mess in short order.

Now one could drill end / end holes in tube and then using a slit saw/ grinding wheel slice the material away ( being done under size ) and then mill it to size which one could do with a much smaller cutter and not have near the chatter issues.  * tho a robust machine is still going to be required ... IMO.
  • Northern California ... Old Hangtown
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Offline SpiralGroove

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  • >The gun's gotta look good and shoot straight ->
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Re: Tuning Question?
« Reply #2 on: January 10, 2019, 08:35:12 AM »
Thanks Motorhead,
You know, I thought about this before I purchased the part, but forgot until now........., but if I drill/mill out the beginning of the skirt on the HW95 piston ... to fit my R10; I will need to completely, cut through the piston skirt and into the existing cocking slot.  I think this will ruin its functionality as there is no horizontal strength to the piston.

I think I need to sell the piston as it isn't going to work :P.
  • Bothell, WA
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347
BSA R10 (.177), BSA R10 (.22)
Beeman R10 (.177) or (.20)
Diana Stormrider (.177)
HW30S  (.177), HW30S (.177)
HW35ES (.177), HW35E (.177)
HW50SS (.177), HW50S (.177)
HW77K (.177), HW80 (.20)
HW95 Hybrid (.177)
QB78D (.177), QB78DHPA (.22)
QB79HPA (.177), QB79HPA (.22)

Selling:
- BAM B50 .177 caliber
- Hatsan AT44 -10 .177 caliber - exc. condition
- Diana Stormrider .177 New, except sm. stock chip
- 2 -> .22 caliber HW barrels w/CL: HW30 & HW35
- 2 -> HW50S Stocks - Both in excellent condition.

Offline SpiralGroove

  • Ruminating Perfectionist !!!
  • GTA Senior Contributor
  • ******
  • Posts: 4379
  • >The gun's gotta look good and shoot straight ->
  • Real Name: Kirk
Re: Tuning Question?
« Reply #3 on: January 10, 2019, 09:11:36 PM »
Sorry tuners,
I forgot the (unique) slot for the R10 is on the top and not the bottom of the piston, so no interference with the cocking slot ... whew ::).  Hence, I will drill the piston top with a carbide drill bit, larger/longer than the normal R10 slot so there is no question of whether or not it will bump anything.
Once the holes are drilled, I will use a diamond bit in my Dremel to smooth.

Problem solved, I think ............................ :D
  • Bothell, WA
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347
BSA R10 (.177), BSA R10 (.22)
Beeman R10 (.177) or (.20)
Diana Stormrider (.177)
HW30S  (.177), HW30S (.177)
HW35ES (.177), HW35E (.177)
HW50SS (.177), HW50S (.177)
HW77K (.177), HW80 (.20)
HW95 Hybrid (.177)
QB78D (.177), QB78DHPA (.22)
QB79HPA (.177), QB79HPA (.22)

Selling:
- BAM B50 .177 caliber
- Hatsan AT44 -10 .177 caliber - exc. condition
- Diana Stormrider .177 New, except sm. stock chip
- 2 -> .22 caliber HW barrels w/CL: HW30 & HW35
- 2 -> HW50S Stocks - Both in excellent condition.

Offline SpiralGroove

  • Ruminating Perfectionist !!!
  • GTA Senior Contributor
  • ******
  • Posts: 4379
  • >The gun's gotta look good and shoot straight ->
  • Real Name: Kirk
Re: Tuning Question?
« Reply #4 on: January 13, 2019, 11:56:58 AM »
Hey Tuners,
Got the drill press method to work ;).



  • Bothell, WA
1973 Benjamin Franklin 342
1984 Benjamin Franklin 347
BSA R10 (.177), BSA R10 (.22)
Beeman R10 (.177) or (.20)
Diana Stormrider (.177)
HW30S  (.177), HW30S (.177)
HW35ES (.177), HW35E (.177)
HW50SS (.177), HW50S (.177)
HW77K (.177), HW80 (.20)
HW95 Hybrid (.177)
QB78D (.177), QB78DHPA (.22)
QB79HPA (.177), QB79HPA (.22)

Selling:
- BAM B50 .177 caliber
- Hatsan AT44 -10 .177 caliber - exc. condition
- Diana Stormrider .177 New, except sm. stock chip
- 2 -> .22 caliber HW barrels w/CL: HW30 & HW35
- 2 -> HW50S Stocks - Both in excellent condition.

How do you word it... "Air Guns" or "AirGuns"?