Carrier Track Variations

[Lynn Eades]

Jack. First of all I edited my previous post where I said they mount on 16 bolts. In fact they mount on 18 bolts. (I should have checked first)
Now that I see your sprocket, I dont know what you are after? The new made one looks to be a copy of a std. Australian one. The only difference with a British or Canadian one is the thickness (no shoulders ) The thickness being 19mm (3/4")
It is hard to measure the root diameter because a gap on one side lines up diametrically with a tooth on the other side. The answer would be to swing it in a lathe, but I cant do that. So my estimate would be 474mm. Does that help?

I have a few NOS Australian sprockets, but they are buried and very greasy. Not fun to deal with.

[Jack Geratic]

Hi Lynn, yes just trying to obtain the sprocket diameter in relation to the bogie.

All I can do is guesstimate on a photo, scaled so the bogie diameter is 20 inches. Sprocket diameter including the teeth looks to be about 25 to 25 1/2 inches but must be a bit less than this because the photo is slightly angled such that the sprocket is closer to the camera/viewer.

sprocket bogie VIB.jpg

[Lynn Eades]

Hi again. The overall dia of the sprocket is about 525mm dia. (20 11/16 ish) (max dia.) The bore is probably 16" (406.5mm ish?)

That sprocket (your pic) looks like a later type Canadian one with integral shoulders to carry the track better. (reduce wear) The LP2 / 2a. later had bolt on supports (I've only seen the drawing in a manual) probably similar to the Loyd carrier ones.

What are you trying to achieve? If I knew that, it would make sense to me and what I write might be more useful to you.

[Lynn Eades]

Jack, I was just looking at yor photo post #36. Shouldn't the sprocket sit on a shoulder (spigot?) They are usually a tight fit to stop the sprocket walking on the bolts?
Do you have one of the Vickers Light Tanks?

[Jack Geratic]

Hello Lynn

Both those photos are of the Vickers Light Tank sprockets. The newly machined one is from Colin Jones showing his handiwork while the cropped image of a brightly painted vehicle is from a museum.

Another photo from Colin's progress showing the attachment point for the light tank sprocket

20211025_163417.jpg

My intention overall was to confirm that the sprockets and bogies are the same diameter for both the VI light tanks and carrier which I believe has already been established. The reason for wanting to know actual diameters is to ascertain how accurate the scale kit manufactures have provided for these two particular subjects.