[CB-C2] Gland Size about voronmods

[whi-tw]

Just spotted #3. Seems to be the same issue I had with https://www.amazon.co.uk/gp/product/B07QHSRB45.

I have just started a return, and have ordered https://www.amazon.co.uk/gp/product/B07QPXF3WC, and will update when I receive it on Thursday.

It might be that it 'fits', but the pitch isn't correct (if you modelled it for M12 specifically). If so, it could be worth making a PG7 variant of the part?

[kejar31]

You need to make sure that the gland is never had a larger circumference than 18mm

[whi-tw]

@kejar31 for sure, fully understand that. The potential problem I'm seeing is that if the thread pitch is modeled for M12, it won't necessarily mesh correctly with the PG7 thread. A comparison of the thread pitches is here.

Specifically, the dimensions are different (all in mm, taken from the linked PDF):

Thread	Major Diameter	Pitch	Through Hole	Flank Angle
M12	12	1.5	12.5	60°
PG7	12.5	1.27	12.7	80°

[kejar31]

Ahh that can easily be fixed in onshape…

…

Sent from my iPhone

On Aug 17, 2022, at 8:06 AM, whi-tw ***@***.***> wrote:  @kejar31 for sure, fully understand that. The potential problem I'm seeing is that if the thread pitch is modeled for M12, it won't necessarily mesh correctly with the PG7 thread. A comparison of the thread pitches is here. Specifically, the dimensions are different (all in mm, taken from the linked PDF): Thread Major Diameter Pitch Through Hole Flank Angle M12 12 1.5 12.5 60° PG7 12.5 1.27 12.7 80° — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.

[whi-tw]

Seems this was a non-issue. PG7 fits A-OK in the existing thread.

Nope, is definitely bending the threads on my glands, as the pitch is 0.25mm too large. printing out some test threads as I have a gland with each thread size, and once they're done, I'll update you.

[whi-tw]

I've made a test part in Onshape, and have made the two possible threads.

Can confirm that the two glands I have are PG7 (the one that fits in the space in CB-C2) and MG12x1.5 (the one that is too girthy to fit properly).

[whi-tw]

PG7-threaded part is in this doc. Untested, but presumably it'll work, as it's got the same thread characteristics as my test part.

[whi-tw]

Confirmed, fits perfectly.