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Tasca M4A1 Grizzly Guardian
rfbaer
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Posted: Saturday, June 28, 2014 - 06:19 AM UTC
Best I can come up with too.....
but then, why is the hole there in the first place?
Ask Snuggles, and I'll ask SK.
Kharkov
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Posted: Saturday, June 28, 2014 - 09:10 AM UTC
This is a much better picture of the holes/hollows in the top of Sexton (Grizzly) bogies, with this picture and the picture posted further back in the thread you can have a bloody good go at converting standard Tasca bogies into Grizzly 'Big Rib' bogies, they might not end up perfect (nothing ever is tbh), but it's kinda fun having a go, the picture also shows the new shape that needs to be added to the return roller mounting bracket, where it runs close to the hole, a flat angle, instead of Tasca's curved radius.




The above picture should be credited to - Chris 'toadman' Hughes, as he took it I think, a very useful picture indeed.


Purpose of the holes/hollows?

Haven't got a clue really to be honest, probably something to do with the casting process, maybe, the only clue I have is that a bolt has been placed in the spare return roller bracket hole, from underneath, it can't be fitted from the top because there is no angled edge on the front of skid plates, to make room for the bolt, the bolt is just protecting the threads, stopping them from rusting up I think.
Shermania
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Posted: Saturday, June 28, 2014 - 10:25 AM UTC

Quoted Text

This is a much better picture of the holes/hollows in the top of Sexton (Grizzly) bogies, with this picture and the picture posted further back in the thread you can have a bloody good go at converting standard Tasca bogies into Grizzly 'Big Rib' bogies, they might not end up perfect (nothing ever is tbh), but it's kinda fun having a go, the picture also shows the new shape that needs to be added to the return roller mounting bracket, where it runs close to the hole, a flat angle, instead of Tasca's curved radius.



The above picture should be credited to - Chris 'toadman' Hughes, as he took it I think, a very useful picture indeed.


Purpose of the holes/hollows?

Haven't got a clue really to be honest, probably something to do with the casting process, maybe, the only clue I have is highlighted in the circle, a bolt has been placed in the spare return roller bracket hole, from underneath, it can't be fitted from the top because there is no angled edge on the front of skid plates, to make room for the bolt, the bolt is just protecting the threads, stopping them from rusting up I think.





I think your right, casting process and probably helped to reduce the weight of the casting too. BTW, I've always wondered why Canada even bothered to do this in the first place, seems like even on the 42 ton Jumbo the standard castings held up just fine.
Kharkov
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Posted: Sunday, June 29, 2014 - 07:28 AM UTC


All the Grizzly running gear was taken from this beast, the Sexton SPG with a 25 pdr gun, so maybe they were worried about recoil shock being transferred into the bogies so they strengthened them with larger ribs to compensate? I don't know, it's a puzzle...
rfbaer
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Posted: Sunday, June 29, 2014 - 09:50 AM UTC
I wonder if vibration due to the all-steel track was perceived to be an issue?
Shermania
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Posted: Sunday, June 29, 2014 - 11:42 AM UTC
Somewhere at some point in Canada someone surely documented why this change was deemed necessary. I love the Grizzly, it's on our state flag, it's an awe inspiring beast that was revered by Native Americans. It would be cool if all M4 were known as grizzlies, kudos to the Canadians for choosing a very appropriate name for the tank. I too agree that the unique sprockets, CDP tracks, and the reinforced bogies are a nice variation on an already very diverse M4 series. It makes sense to combine the lighter weight of waffle type track With the advantages of live track. Perhaps it was harder to throw tracks on a grizzly than a regular M4 considering the higher number of teeth on the sprocket.
Kharkov
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Posted: Monday, June 30, 2014 - 07:31 AM UTC

Quoted Text

I wonder if vibration due to the all-steel track was perceived to be an issue?



Vibration has been mentioned by a few people as the reason for some of the changes to these 'big rib' bogies.
M4A3E8Easy8
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Posted: Tuesday, July 01, 2014 - 02:20 AM UTC

Quoted Text


Russ,

Pedro, Grizzly is a fantastic name yes, it would be good if the M4's were called Grizzly instead of Sherman, I think we have the British to blame for that, it's a bit like Firefly, such a good name for the Sherman 17 pounder, just kinda sounds right, and yes I agree, it's probably all written down somewhere.





Yes the Brits are to blame (at least that is how I know it and I am sticking to it) how ever I have to disagree. If you make the M4 a bear what would the M48 or the M60 be called?? And would the US now be using the M1A2 kodiak?? Nahh needs to be Sherman so the line makes sense, am I making sense??
Kharkov
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Posted: Tuesday, July 01, 2014 - 09:53 AM UTC

Quoted Text

Yes the Brits are to blame...



The Brits and our obsession with using the letter C for all our tank names, the list is endless.
rfbaer
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Posted: Tuesday, July 01, 2014 - 10:16 AM UTC
It's all clear now.
M4A3E8Easy8
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Posted: Tuesday, July 01, 2014 - 12:42 PM UTC
Funny I had never thought about all the c named Brit tanks. What is it with that country and c? I am waiting on the US to start naming tanks after politicians. That will be just the best ever. Imagine going into combat in the M5A7 Clinton MBT.
Kharkov
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Posted: Tuesday, July 01, 2014 - 01:18 PM UTC

Ref M5A7 Clinton MBT, the Russians could maybe do a T-100 'Lewinsky' to counter it...

:-)
M4A3E8Easy8
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Posted: Tuesday, July 01, 2014 - 03:00 PM UTC

Quoted Text



Ref M5A7 Clinton MBT, the Russians could maybe do a T-100 'Lewinsky' to counter it...





T-100 you say... that would be one big sucker.....



Yeah I know horrid humor but it had to be said by some one.
rfbaer
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Posted: Wednesday, July 02, 2014 - 05:53 AM UTC

Quoted Text


Quoted Text



Ref M5A7 Clinton MBT, the Russians could maybe do a T-100 'Lewinsky' to counter it...





T-100 you say... that would be one big sucker.....





Yeah I know horrid humor but it had to be said by some one.



That's funny right there, I don't care who you are.
Kharkov
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Posted: Thursday, July 03, 2014 - 04:32 AM UTC

Quoted Text

Yeah I know horrid humour but it had to be said by some one.



You were just the man for the job.
Kharkov
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Posted: Monday, July 14, 2014 - 11:13 AM UTC


A fantastic picture showing the four return roller bolts that have been lock wired (no way to tell if this is a post war mod) but lock wire is added to bolt heads simply to stop vibration from loosening the bolts, so that's more on the vibration theme.
M4A3E8Easy8
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Posted: Monday, July 14, 2014 - 12:51 PM UTC
So first question then.. who took the reference photos you show? I can never find good shots like that on the net. I agree with you about a camera, I was using a cheap dig camera and fighting with color like you would not believe, esp since the great US government says we have to use those stupid curly bulbs that confuse the living crap out of a camera's white balance. "I bought the wife" a nice cannon dslr for our extended stay in Taiwan and have borrowed it for my model pics.

Well there is not really a second question. I just sit waiting on the next step.. well that might be a small fib as I am working on the PZ III, it has a show on the 9th of next month.. If I can just figure out how to fill out the entry sheet.
Kharkov
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Posted: Monday, July 14, 2014 - 01:26 PM UTC


Another nice Sherman M4A1 Grizzly picture (I'm running out of pictures already) this one highlights the rough cast surface texture on both the hull and the turret, with the sun shining on the slightly glossy paint it shows up very well, either that or this example has been left to rust very badly before being restored, which is very possible, it also shows a very slight 'flare' on the end of the gun barrel, which is not easy to see normally.


Messing around with blocks

Picture below (right) this simply shows how thin the plastic can get on the Tasca bogies when you remove the standard bogie ribs with a knife and a file, you have to be very careful when handling them afterwards not to break them, but once the new ribs go back on the strength will come back.



Very simple plastic blocks/plates have been glued to the hull sides to allow the bogies to simply snap fit into place on the hull sides, it's very similar to how Tasca have done the job, and it means I don't have to glue anything in place yet.

I also got lucky here, my bogies only just fit between the new bolt heads that I have added on the mounting plates, note to self - measure things much more carefully and more often.

More soon, hopefully...


Matt
rfbaer
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Posted: Tuesday, July 15, 2014 - 04:16 AM UTC
Okay, I confess: this is so much fun if I imagine John Cleese is giving a lecture on Shermans, scratch-building and modeling in general.
Matt, I sincerely hope this is seen a a compliment, that's what it's intent is, but day-um, son, you may have missed your calling.
Carry on.
Kharkov
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Posted: Tuesday, July 15, 2014 - 09:44 AM UTC

Quoted Text

Okay, I confess: this is so much fun if I imagine John Cleese is giving a lecture on Shermans, scratch-building and modeling in general.
Matt, I sincerely hope this is seen a a compliment, that's what it's intent is, but day-um, son, you may have missed your calling.
Carry on.



Compliment accepted, thx
Dragon164
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Posted: Tuesday, July 15, 2014 - 02:42 PM UTC
Matt,
I have had great use out of my two Canon cameras and rarely have to take more than one pic of anything.

Cheers Rob.
Kharkov
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Posted: Wednesday, July 16, 2014 - 03:19 AM UTC

That's exactly what I have just ordered, a little Canon digital camera, a Canon IXUS, nothing mega expensive, just something that should be a whole lot better than my 'not so smart' phone, and then if I start really getting into all this photography lark, I might buy something more expensive.

To be fair to my smart phone, point it at something colourful and it takes a nice picture, but point it at white plastic and it just freaks out.
rfbaer
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Posted: Wednesday, July 16, 2014 - 04:25 AM UTC

Quoted Text


Quoted Text

Matt,
I have had great use out of my two Canon cameras and rarely have to take more than one pic of anything.

Cheers Rob.



That's exactly what I have just ordered, a little Canon digital camera, a Canon IXUS, nothing mega expensive, just something that should be a whole lot better than my 'not so smart' phone, and then if I start really getting into all this photography lark, I might buy something more expensive.

To be fair to my smart phone, point it at something colourful and it takes a nice picture, but point it at white plastic and it just freaks out.





I can see how that would be problem for you....
I use a Canon A2500, given to me as a gift, that does the same thing, and has issues with depth of focus. I can get a nice detail shot of one area of a model, but the rest is always fuzzy.
tankglasgow
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Posted: Wednesday, July 16, 2014 - 04:27 AM UTC
Hi Matt, just looked at your recent posts and been entertained as usual.
I know what you mean regarding the "serious" part of building models I have elderly parents who are now seriously creaking and I have lost my mojo a bit for this lark, It'll come back in time as usual. Good luck with the new camera, in my opinion it's just a tool that some people can get really hung up with. Anyway keep the posts coming, to quote RLS;
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to move."

Paul
Kharkov
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Posted: Thursday, July 17, 2014 - 02:29 PM UTC


Snuggles - "Packed my bags last night, pre-flight."
Kharkov - "Zero hour, nine A.M. Snuggles?"
Snuggles - "I'm gonna be high as a kite by then Dad!"
Kharkov - "Til touchdown brings you round again,..Snuggles."
Snuggles - "All this science Dad?, I don't understand..."
Kharkov - "It's just my job, five days a week."
Snuggles - "I'm a Rocket man Dad!"
Kharkov - "Burnin' out his fuse?"





Matt