So, you have had failures with Delrin: n = 1. I'm quite curious as to the nature of these failures. They are somewhat remarkable.Weihrauch, Diana, and Walther use Delrin for their guides, ...
Quote from: Ilimakko on February 06, 2022, 10:28:50 AMSo, you have had failures with Delrin: n = 1. I'm quite curious as to the nature of these failures. They are somewhat remarkable.Weihrauch, Diana, and Walther use Delrin for their guides, ...I've found 2 broken Diana guides (flange broken off at the base.) I'm guessing I've had 10 apart. I don't know how typical it is, but it happens.
Hi Ron,I don't know how to identify different plastics. I offered my observations as to the nature of guide failure, but I don't claim any expertise with materials or machining.
So Hector,What "different material" do you use? Hope this is not a state secret?I assume magnesium would be ideal?-Y
Thanks Hector for the ample data points!The sharp-cornered, abruptly diameter-reducing "notch" is an obvious potential point of failure, even to a non-engineer such as myself. Other Delrin guides have nothing like it, and well-made ones have proper radiusing at the corners that are present. A huge factor in guide performance, over material choice, is the design and execution. Murky waters ahead, as far as differences between materials are concerned. Mostly Delrin-loving Brits also talk about recent Air Arms steel guide breakage.
I would test the Crosman 10.5's in Dome and HP configuration.
Doesn't the recentish quality crash of Crosman pellets apply to these? A tin of the .22 cal Premiers that I tested showed extreme spread in pellet head size, and I have heard nothing good about these from anyone, after the boxed, selected pellet option was killed.Also, aren't the .177 cal Crosmans made from the same, high-antimony lead that fouls barrels like no other, especially in a high-velocity context? These are the two dealbreakers that make me steer clear of the Crosman option, lest contradictory evidence comes to light. A look at my usual sources tells me that providing ammo for a high-power .177 cal is not unlike hunting for .20 cal pellets, or high-quality .25 pellets. There really aren't many options around, in the 10 - 11 gr. quality dome sector. The prices per pellet also match or exceed the prices for quality .22 cal ammo.
The other aspect is that ONLY the boxed Premiers were made with the high antimony alloy, the rest of the machine worked with pure lead pre-forms.
Do remember that the head diameters by H&N and by JSB are DIFFERENT THINGS altogether. And so the success in one is not indicative of possibility of success in the other.Above all, ENJOY the ride! ;-)Thanks for the data.HM