Indians For Guns

Hello Tuners,
I would like to know the rear Guide OD for IHP35. I am planning to send some springs to a friend of mine.

-Suffix

Surprised to see that there is no reply May be no one like to tune an IHP?

Well it was Holi and the weekend and all that here......I missed reading your post too.........

If the springs you are procuring are meant for Diana/RWS they will fit....If you still want dimensions, can you wait for another 10 hours, I'll push the data to you when I reach home.

On second thoughts...tell your friend to make a custom spring guide...the origianl IHP guide belongs in the trash can....If your friend is in Mumbai, I can help him out all the way......

So let me know....

M.

Thank you very much! Funtumfan2003!

I can wait
-Suffix

The OD varies from 12.25 to 12.45 mm. Its not perfectly cylindrical and the measurement varies along the length.

Who is this friend of yours ? And what make of springs is he seeking from you ? I would like to help......
PM me the details......

M.

Hi Manish,
> Agree with you the IHP rear guide is pathetic to say the least. It's actually sheet metal folded & welded rather crudely.
> The OD is as you mentioned 12.45mm - however if you are changing the spring - these come with different IDs - hence rear guide OD has to be a perfect fit, else it won't serve the purpose.
> Suggest that depending on the ID of the spring the rear guide has to be preferably machined with a +/- 0.5mm to 0.75mm tolerence on the lower side.
> This will enable a 'snug' fit' which is necessary as the spring expands when cocked - allowing the spring to be released smoothly without a wobble.
> Also recommend to increase the length of the rear guide by 10mm to 12mm as compared to the IHP rear guide.
> A light coat of Moly both on the guide & spring surface will aid better performance.
> Delrin or SS would be an ideal choice for machining the rear guide. Personally I've used SS and it has worked wonders!
Cheers
Briha

brihacharan wrote:Hi Manish,
> Delrin or SS would be an ideal choice for machining the rear guide. Personally I've used SS and it has worked wonders!
Cheers
Briha

Sorry for posing a couple of naive Qs here Would "SS" stand for Stainless Steel or something else ? Now a fabricated guide would still have the welding job necessary, right ? Would that not leave an uneven (rough) linear patch on the insides even if outer roughness is polished off ?

Thank you all!
So looks like a spring that has ID = 12.6~12.7mm should be an excellent fit for IHP35. Hmm sounds like BSA super sports (FAC) spring will do the magic

-Suffix

SUFFIX wrote:Surprised to see that there is no reply May be no one like to tune an IHP?

yeah Suffix...

Anyway....the original IHP guide is rolled sheet steel, the OD varies between 12.5 to 12.58mm...you can machine a single piece guide out of brass or MS/Delrin with a suitable OD....the spring must be snug fit on the guide, not too loose not too tight....

here is a picture of a machined MS guide surface hardened to 25microns to fit a James Maccari XLR2 spring....



or even brass...



regards

p k jeetesh

airgun_novice wrote:

brihacharan wrote:Hi Manish,
> Delrin or SS would be an ideal choice for machining the rear guide. Personally I've used SS and it has worked wonders!
Cheers
Briha

Sorry for posing a couple of naive Qs here Would "SS" stand for Stainless Steel or something else ? Now a fabricated guide would still have the welding job necessary, right ? Would that not leave an uneven (rough) linear patch on the insides even if outer roughness is polished off ?

Hi Amol,
> SS is for stainless steel - I preferred it for its machinability, and its resistance to rust. Looks good too.
> As Jeetesh has mentioned Brass also serves the purpose, but is softer than SS.
> Rear Guides should preferably be machined as there is no welding involved - IHP does it out of sheet metal rolling & welding to save on costs. The final job is crude & uneven - precision goes for a toss.
Cheers
Briha

Check PM

SUFFIX wrote:Hmm sounds like BSA super sports (FAC) spring will do the magic

-Suffix

pkjeetesh wrote: here is a picture of a machined MS guide surface hardened to 25microns to fit a James Maccari XLR2 spring....

p k jeetesh

What is the Piston ID ?

fantumfan2003 wrote:Why bother with Crosman and Titan springs in an IHP ? Your friend (who he is, you do not wish to tell me......?????) is wasting his time and making a GOOD gun VERY BAD in the process....

Its a waste of time and money putting a Crosman or Titan in an IHP.

M.

May be this a good place to talk rather than PM. I personally don't like PM in forum as there in nothing personal here
By the way, why do you think Crosman or Titan is not a good choice?

So who is this friend of yours for whom you are going all out for advice ?

M.

SUFFIX wrote: May be this a good place to talk rather than PM. I personally don't like PM in forum as there in nothing personal here
By the way, why do you think Crosman or Titan is not a good choice?

brihacharan wrote: Hi Amol,
> SS is for stainless steel - I preferred it for its machinability, and its resistance to rust. Looks good too.
> As Jeetesh has mentioned Brass also serves the purpose, but is softer than SS.
> Rear Guides should preferably be machined as there is no welding involved - IHP does it out of sheet metal rolling & welding to save on costs. The final job is crude & uneven - precision goes for a toss.
Cheers
Briha

Thank you, Brihacharan, for the clarification. Really appreciate all the gyaan.

-- Thu Mar 24, 2011 8:53 pm --

Dear Suffix,

Agreed that 'phoren' springs are usually better, but then would it not be cheaper and better if similar springs which are duplicated in India are used by guys in India instead ? Just give an impetus to local economy in these days of stagflagnation. Not to hijack this thread, but I am seriously thinking of going for Kolkatta-based SDB as my second (or rather third) air rifle, rather than ordering one from Pyramid Air. What say ? Awaiting my wife to get in real great mood so could "con"vince her.

If you really want to try an imported spring - try this - Get a crosman spring part no. from Crosman.com
and order it from www.abairgun.com.
/s/