GTA
All Springer/NP/PCP Air Gun Discussion General => "Bob and Lloyds Workshop" => Topic started by: adrianm1972 on March 22, 2018, 01:03:46 PM
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Hi guys, I was wondering if you/we could put together a thread with dimensions, details and drawings of commonly used air gun parts that modders or amatuer designers could for reference?
I am a former machinist, CAD/CAM designer that loves shooting, modding and designing air guns. I am working on a new project scratch building a PCP air rifle and I found myself googling and struggling to find dimensions and details for air gun parts that I did not have in front of me. Stuff like where are the locations for the breech o-rings and port on a marauder barrel? What is the standard stroke of a QB-78, 2240, Marauder hammer? How much does the valve stem stick out for the hammer to hit on a QB, 2240, Marauder valve? Stuff like that.
Would this be a good place for that or the Machining threads?
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1. The primary purpose is to collect the important threads from Bob and Lloyd in one place.
2. We will add our new build threads, testing threads and theoretical discussions, and anyone is welcome to comment on them, but please STAY ON TOPIC.
3. Others are welcome to post Airgun or Materials QUESTIONS to us of a Technical nature, that they think we may be able to help with.
4. This is not a place for others to post their projects, or general questions or discussion, that should remain in the current appropriate Gates.
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I would suggest that the Machine Shop Gate would be the appropriate place for such a thread.... however I don't think the participation would be great.... Speaking for myself, I only make partial drawings such as I need for my modifications.... What you are looking for is an archive of dimensioned drawings of stock guns.... Since the manufacturers are not likely to share, that means somebody has to take the time to sit down and draw out what already exists, which to me rather seems a waste of time.... Yes, it would certainly make it easy for others.... but a the countless hours required simply to make others projects easier seems a bit much to ask for.... JMO....
Bob
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Fair enough, thank you.
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I almost always start with a pencil sketch to get an idea from my head, onto something that doesn't fade in and out, LOL. Then I'll make some sort of simple 2d cad model, often measuring parts that I have on hand and modeling them. Or sometimes I'll start with an old model and strip it down as a starting point. But like Bob said, the models are usually incomplete, and might have mistakes, and are almost never properly dimensioned. Turning a quick 2d model into a "properly" dimensioned drawing almost doubles the time for me, and I only do that if I am having parts made by an outside machine shop.
I do have to say though, that having a cad model to work to cuts the machining time in half.... or more. And it eliminates a lot of re-starts from messed up parts. As I go along, I update my model with as-built corrections for any tweaks or screw-ups that occurred during machining.
Another thing I do that is very helpful to me, is being very conscientious about layer control, keeping each type of part on its own layer. Being able to turn the layers on and off is extremely helpful.
Unfortunately, I do not do 3d modeling, and I wish it was something I had learned years ago because I know it would be helpful, but I didn't. Oh well.
Lloyd