How to Torture the Spring Guide?

The is very common in HW Spring guide. Is there anything wrong with the material? NO.

If you see closely, the material is cast Nylon 6 and the property below:

  • High modulus
  • Low stress
  • Good dimensional stability
  • Non galling
  • High fatigue resistance
  • Abrasion resistant
  • Low coefficient of friction
  • Vibration and peening resistance

But surely something is wrong with the fitment and balance between the steel ring and the guide; thus the 800 newton gives unprecedented off-axial force on the ring and you will have this result.

Good that they have used Cast Nylon . If they would have used Delrin the result could have been a disaster. Because delrin cannot take this much abuse.

Let me show you an example:

A customer purchased one of our Gamo tune kits and he decided to use a spring from a different source. He requested us to make the spring guide as per his requirement. He shared the dimension of the spring. After analysis, we had suggested what the OD of the spring guide should be. However, he wanted a much  bigger OD than that in our recommendation.

We supplied the tune kit together with  caveat that a bigger OD may cause that the guide to be tortured heavily. The customer informed us later that using bigger OD resulted in what we anticipated and warned against:

Lets see what might go wrong here.

1) Delrin is not like cast Nylon. It breaks.

2) If you see the broken part, left end, it looks like it is uprooted and it can happen only when the force acted somewhere middle of the guide heavily

This can happen only when the guide is too tight for the spring or the spring is not evenly coiled. And top of that, there is another possibility that can support this would be, the spring end was not grounded properly which led to the breakage of some part from the neck.

Anyway, the good news is: Globally we have a few hundred customers. But only one customer had this issue.

Interestingly, this customer, purchased the product on 3rd December, 2010 and after one year he came back to us and demanding for a REPLACEMENT!!

And top of that, he is kind of blackmailing by saying if we do not fulfill his demand, he will tarnish our company’s reputation.

We think, this demand is unreasonable on his part. We are sure you would find this unreasonable too.

If anyone is interested to read about his complain we found the link of the customer and here it is.


One response

  1. Sono un vostro cliente conosco i vostri ottimi lavori, siete persone per bene purtroppo nella massa capita qualche imbecille che si improvisa tunizzatore.
    Buon lavoro.

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