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  #11  
Old 12-12-2019, 02:11 PM
KBS KBS is offline
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I'll bet if you contact an experienced metal sales person ,they will know. Wood has a nominal dimension of what the rough cut was and you get what it is after it is planed. I wonder if they add as few thousands so it can be perfectly sized by the end machinist?
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  #12  
Old 12-12-2019, 07:04 PM
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Originally Posted by KBS View Post
I'll bet if you contact an experienced metal sales person ,they will know. Wood has a nominal dimension of what the rough cut was and you get what it is after it is planed. I wonder if they add as few thousands so it can be perfectly sized by the end machinist?
That would make perfect sense to me if it was a rolled stock.
But this is a finished shaft with keyway in a gear reducer box.
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  #13  
Old 12-13-2019, 11:06 AM
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Farm store metric is shady stuff. Always undersize, so it spins in the bearings.
Case in point. Went to TSC to get some 6203 bearings for a belt sander. You'd think that if the bearing says "6203" on the side it will meet the decades-old specs of 17x40x12(mm). I've probably installed 100 of these over the years in various autos, trucks and equipment and they were all the same "standard" dimension.

So disregarding that the packaging says "5/8" (~16mm), I buy them figuring they are just allowing 1mm "farmer slop"... Nope, bearing measured 16.something mm ID. (I don't have my measurements handy). Local ACE Hardware had two REAL 6203s and at half the price ($8ea) of the auto parts stores.
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  #14  
Old 12-16-2019, 01:29 PM
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the Metric Od inch Id bearings have been around a long time I used to stock 5 of each because I never knew when an inch shaft repair project would hapen.
it is realy no big deal if you are careful to read before you buy.
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  #15  
Old 12-16-2019, 04:54 PM
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That being said, there are some pretty sad digital calipers on the market today that pretend to be accurate measuring tools. Those will bite you in the butt too.
I would say it is more the moron, not being able to read the caliper, especially if it has a vernier on it...
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  #16  
Old 12-16-2019, 07:32 PM
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Along the lines of this post, I once again ran into this yesterday.
Making a tool to fit into a small boring head. I am thinking 1/2"???
Umm, no.
It's 12.67mm which is .4988, a precision ground hole that is sloppy loose with a 12mm round stock, and is 2 thou too small to fit a 1/2" round into.
Measured with a telescoping gauge and micrometer.
The hole fits the common Chinese boring tips perfectly, so everybody in the metric world knows what is going on....I don't.
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  #17  
Old 12-16-2019, 10:27 PM
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Here is a question, why are 1/8” pipe grease zerks 1/8-28 thread instead of 1/8-27 thread? The 28 thread is BSTP or British Standard Taper Pipe, while the 27 TPI NPTis American Standard.

Now I know why half the grease zerks threaded hard in the last year. I used the wrong tap, not paying attention to 28 instead of 27.


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  #18  
Old 12-17-2019, 12:16 AM
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Quote:
Originally Posted by Ironman View Post
Along the lines of this post, I once again ran into this yesterday.
Making a tool to fit into a small boring head. I am thinking 1/2"???
Umm, no.
It's 12.67mm which is .4988, a precision ground hole that is sloppy loose with a 12mm round stock, and is 2 thou too small to fit a 1/2" round into.
Measured with a telescoping gauge and micrometer.
The hole fits the common Chinese boring tips perfectly, so everybody in the metric world knows what is going on....I don't.


I always prefered boring heads with 5/8” holes...maybe that’s why. I likely have sleeves I’ve made to use 1/2” tools in the 5/8” holes somewhere too....

We can always make that hole a thou and a half larger....


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  #19  
Old 12-17-2019, 12:17 AM
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Quote:
Originally Posted by toprecycler View Post
Here is a question, why are 1/8” pipe grease zerks 1/8-28 thread instead of 1/8-27 thread? The 28 thread is BSTP or British Standard Taper Pipe, while the 27 TPI NPTis American Standard.

Now I know why half the grease zerks threaded hard in the last year. I used the wrong tap, not paying attention to 28 instead of 27.


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Seems I hadn’t noticed that one...though the majority of grease fittings I’ve dealt with the last few years have been metric anyway.


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  #20  
Old 01-09-2020, 05:46 PM
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Here again today it happened.

I have a Hatz diesel on the floor, to be coupled to a pump. So I measure the shaft...1.25" on the pump. The Hatz engine is 25.35mm. So I called the bearing house and told them one Lovejoy end needs to be 25.35 and he just laughed at me.
He said 25 mm is what we can supply, you'll have to get someone to bore it out for you. It is just a shade to tight to get a 1" bearing on the shaft without a hammer.
I may have to get a 1" hub and start the engine and use a file on it til it fits.

This is Trumps fault.
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