All Springer/NP/PCP Air Gun Discussion General > 3D printing and files
To Subscriber - Gamo Urban moderator insert similar to the Notos insert
naptemp:
Subscriber, you have made a fantastic moderator insert for the Umarex Notos.
I have 2 Notos and both have your insert.
I really thank you for that.
The Gamo Urban has a similar moderator (permanently glued to barrel) with an insert attached with 2 pins just like the Notos.
The same (permanently attached) moderator is used on several other Gamo and BSA airguns.
The Gamo Urban has been sold for many years and yet no satisfactory moderator appeared.
Unhappy people will just remove the original moderator by any means they have.
Subscriber, I am asking you really nicely if you could make a moderator insert for the Gamo Urban.
Let me know if I can help.
subscriber:
John,
Considering that I check this gate sporadically, your post makes an interesting alternative to a PM :)
I would need the interface dimension to do an Urban specific design. Removing the stock baffles and measuring their features would help. The cavity in the casing should also be measured as it will be larger than the insert. Diameter and depth, with some idea of the internal shape (pictures). Pictures of the stock baffles too.
Diameters should be measured at a number of places around the part (because they are not actually round). Also, the retaining pin size and locations relative the the front face of the casing; and relative to the front and rear "shoulder" features of the stock baffles. The spacing of the retaining pins around the center is obviously also rather important. The more accurate the measurements the better.
You can't have too many features measured, but you can have too few.
I no longer get GTA forum update notifications, for unknown reasons. So, I will check back here next week. PMs still seem to work, with notifications.
I assume you want an extended moderator, like the one you have on your Notos?
naptemp:
Subscriber,
Thank you for your reply.
I have just bought a Gamo Urban and will be a while until I receive it.
I used to have one but sold it.
At the time I have printed this insert which fitted perfectly: https://grabcad.com/library/gamo-urban-baffle-core-upgrade-1
That insert reduces the noise somewhat, but I think it is too short.
I think you could the measurements from the stl file above.
An extended moderator for sure.
The quieter the better.
Once I get the Urban I can send the measurements.
This is how the baffles look.
subscriber:
Thanks John,
The length of the "body" (without the stem) measures 115+ mm from the STL. That is rather short.
I may be able to core out the STL after converting it to a Solidworks part. Then extend it a similar length I used for the Notos muffler; and populate it with my own baffle design.
But, where does the barrel go, relative to that "stem"? What is the stem's function? The Urban front end image does not help answer those questions.
Are the rectangular slots at the front where the retention pins fit? See image with red lines below. If so, then those features have to stay. It would be helpful to see the cavity this insert fits into to extend it intelligently.
My opinion of that STL design is that it has too many baffles, too close together. That the baffle walls are too thick; and that these factors combined reduces the expansion volume excessively.
naptemp:
--- Quote from: subscriber on October 15, 2023, 05:38:36 AM ---Thanks John,
The length of the "body" (without the stem) measures 115+ mm from the STL. That is rather short.
I may be able to core out the STL after converting it to a Solidworks part. Then extend it a similar length I used for the Notos muffler; and populate it with my own baffle design.
But, where does the barrel go, relative to that "stem"? What is the stem's function? The Urban front end image does not help answer those questions.
Are the rectangular slots at the front where the retention pins fit? See image with red lines below. If so, then those features have to stay. It would be helpful to see the cavity this insert fits into to extend it intelligently.
My opinion of that STL design is that it has too many baffles, too close together. That the baffle walls are too thick; and that these factors combined reduces the expansion volume excessively.
--- End quote ---
Unfortunately I do not remember how the moderator looked internally.
I think we should wait until I receive my new Gamo Urban (around beginning to mid November).
Then I can provide you with detailed dimensions and photos.
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