Caldwell BR

A

armabill

Member
I have a Caldwell BR Competition rest and I'm trying to determine the ram/post thread size. Caldwell manual shows that it's a 7/8-6 Acme thread but it's not.
I tried 1-8 and 1-14 but it's not it either. I thinking that it might be metric.

Does anyone have any idea the thread size on this ram/post?

The base is good for what I'm using it for but I did replace the top with a Fudd. My aim is to find a nut to use underneath the top to lock it in place. It sometimes loosens from vehicle vibration and use. I tried using blue lock tite on the top screw but it still comes loose. This doesn't happen much but when it does- it's irritating.

Any help would be appreciated, thanks.
 
I would suggest that you call Grizzly. They have been helpful to me when I needed assistance in the past.

Bill Jacobs
 
Also keep in mind that different rests did not all use the same size stem and thread pitch. A friend ordered a new BR front rest and it was actually quite different than my own and his stem is 7/8 X 10 threads per inch and I just now checked it to see what his actually is. I also made jam nuts for the both of ours and one of them is shown below.

 
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I found my screw pitch gauges and it's 12. So it's 1-12 thread. The only size nut that I didn't try at the store only because they didn't have any.

Why is there such a wide range of tread sizes on the same type of model rests. If i ordered a wheel from Cladwell, who knows what size I'll get.

I like the way that you put a handle on that jam nut. Now I'm on the hunt for that 1-12 nut. Thanks to all for answering my question.
 
It is quite odd that they are not all the same? I actually ordered a new complete upper top assembly for my rest sometime back. I needed two at the time and the threaded rod and thread pitch on it was not the same.
 
I looked through my "stuff" and found a 1-12 tap but no drill. It's cheaper for me to order the nut than to buy a drill to drill out an undersized nut.

Will place an order on Ebay, 2 for $12. Yeah, I can't understand why the thread size would keep changing. It makes it confusing when trying to order a threaded part.
 
are you sure..
type of thread v vs acme
most rests use an acme thread for the post
midway pic clearly shows an acme type thread on the post


armabill said:
I looked through my "stuff" and found a 1-12 tap but no drill. It's cheaper for me to order the nut than to buy a drill to drill out an undersized nut.

Will place an order on Ebay, 2 for $12. Yeah, I can't understand why the thread size would keep changing. It makes it confusing when trying to order a threaded part.
Click to expand...
 
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I personally have not seen an Acme Thread being used on a Caldwell front rest. But you are indeed correct in that it was more typically being used. When I find the time I need to go take a look at what my Randolf Rest actually has.
 
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I bought a 7/8-6 Acme nut and it won't fit. I got this size from the Caldwell Competition manual.
There isn't a date on that manual but from the thread size, it might be an older one? I can't find
my manual that came with the rest. Whether that would help me, I can't be sure.

The 1-12 tap that I found fits exactly when put on top of the threaded post. This coincides with
the thread gauge. Like as stated previously, I tried a 1-8 and 1-14 nuts and they don't fit either.

The 1-14 wants to go on but stops at a couple of threads in. Now I know that it's not a metric
thread but I think that the rest top screws are metric- at least that's what the manual says, if you
can believe it.

Sinclair uses a 1-14 thread on their larger rests.
 
rsmithsr said:
are you sure..
type of thread v vs acme
most rests use an acme thread for the post
midway pic clearly shows an acme type thread on the post
Click to expand...

So, where did you get this info! Caldwell originally came out with a 1"X12tpi post size. For what ever reason a few years ago they changed to the 7/8"X6tpi acme threaded post. Bald Eagle, the original 3 legged Hart and Sinclair had 3/4X10tpi post. The Sinclair competition rest has a 1X14TPI post.
 
well in context of cheap rests. most that i have owned were acme.
yes both of my sinclair competition rests are not.

Butch Lambert said:
So, where did you get this info! Caldwell originally came out with a 1"X12tpi post size. For what ever reason a few years ago they changed to the 7/8"X6tpi acme threaded post. Bald Eagle, the original 3 legged Hart and Sinclair had 3/4X10tpi post. The Sinclair competition rest has a 1X14TPI post.
Click to expand...
 
"well in context of cheap rests" By your post you have owned a few cheap rests. I guess you know why the "cheap" ones had acme post. What reason did they have the acme posts?
 
I bought my first Caldwell rest when they first came out and then modified it quite abit. I now have a Randolph and it now better fits my own needs. But you are right if one can afford it to go for something that might be a slightly higher price.
 
Louis.J said:
I bought my first Caldwell rest when they first came out and then modified it quite abit. I now have a Randolph and it now better fits my own needs. But you are right if one can afford it to go for something that might be a slightly higher price.
Click to expand...
A cast iron base is a cast iron base. You can argue about the rest tops, but not much to argue about with the bases. I like the Bald Eagle's rack & pinion quick vertical adjustment, but once it is set it normally stays put. The Caldwell base is tall and can give trouble at ranges that the targets are lower the the bench. With a good rest top, they will all preform fine.
 
My Caldwell base if memory serves right weighed 22lbs. and I am not sure if is even offered anymore. The newer ones I have seen are in no way the same. My is pictured on the first page.
 
Louis.J said:
My Caldwell base if memory serves right weighed 22lbs. and I am not sure if is even offered anymore. The newer ones I have seen are in no way the same. My is pictured on the first page.
Click to expand...

Louis, other than the rest top it is the same as sold today. Oh yes, the newer ones have the 7/8x6tpi acme thread and the old ones were 1"x12tpi.
 
maybe the nut you got is not Acme ( not typically found in hardware stores) then there is the possibility that, if it was ordered, it was picked wrong or packaged wrong. (or it is a 12 count metric thread, diameters differ) It happens. Gm kept shipping the passenger sider door handel assembly to my dealer when we needed the drivers side, right stock number wrong part in packaging. Took a bit to get that glitch worked out. Then there is the chi-com sizing- always just bit south or north of spec. not much help -just what I have run into over time.
 
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