• Over 10 years ago, (September 10, 2010), Nelson Timken, our founder, had a dream of a friendly machinist site, where people could learn the hobby of machining. We want to wish everyone a healthy, happy New Year, full of joy and success. God bless you, and thank you for supporting The Hobby-Machinist.

3-Plate Method, Surface Plates?

middle.road

Granite Stoopid...
H-M Supporter Gold Member
Joined
Apr 28, 2014
Messages
3,451
OK, so, I going to open up a discussion on this far-fetched thought. (Blame the Cerveza... :grin: "
I case you haven't seen 'The Haul' click -=- HERE -=-

With so many at my disposal. . .
Is it possible to true up surface plates using the 3-plate method?
A 'brief' review of YouTube last night and I'm not sure this is possible, but it makes sense to my addled mind.

First - there is the matter of picking up and 'flipping' one plate onto another.
Secondly, there is the matter of picking up and 'flipping' one plate onto another.
Thirdly, there is Honey's patience with this entire fiasco...

But I'm curious, what do y'all think? :cower:

Back in the day when I needed to get plates calibrated I'd just call a service, and then stand there watching as they worked their magic.
Of course this time around I don't have a company that is paying the charges.

Last Thursday morning I submitted requests for surface plate calibration to two companies that have locations in Nashville and Chattanooga .
Have not heard back from them...
 

Bob Korves

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Jul 2, 2014
Messages
7,409
It is entirely "possible" to make a flat plate using the 3 plate method. It is also fussy and will take you forever from scratch, at least to do it right. The first accurate plates were made using that method. Then they mostly stopped using it, at least for getting something done, not just proving a concept. These days, there is no reason for using the three plate method for any useful reason, but rather only to prove it can be done. Instead, use an autocollimator and repeat-o-meter, along with the necessary skills, and then get on to your REAL project, whatever you want to make flat...
 

middle.road

Granite Stoopid...
H-M Supporter Gold Member
Joined
Apr 28, 2014
Messages
3,451
It is entirely "possible" to make a flat plate using the 3 plate method. It is also fussy and will take you forever from scratch, at least to do it right. The first accurate plates were made using that method. Then they mostly stopped using it, at least for getting something done, not just proving a concept. These days, there is no reason for using the three plate method for any useful reason, but rather only to prove it can be done. Instead, use an autocollimator and repeat-o-meter, along with the necessary skills, and then get on to your REAL project, whatever you want to make flat...
The problem is that I don't have access to an autocollimator or a repeat-o-meter... :grin: Wish I did!
There's not even a calibration service in East TN that I could find.
Now if I could run down to Tifton, GA and visit Keith, then maybe. . .
Or else if I was located near you guys in central CA. :cool 2: (What a weekend get-together project that would make!)

It was just a thought I had before I picked them up on Tuesday given what I have to work with.
But then after tossing them around this week. . .
 

matthewsx

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Jan 2, 2019
Messages
2,606
How flat do they need to be for your shop? If it were me I'd be inclined to use them as-is until I came upon a project where I knew they needed to be better.

John
 

Aukai

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Oct 4, 2016
Messages
3,021
Last December the wife, and I spent a week in Nashville, and had a blast, I even remember most of it.....continue on....
 

Bob Korves

H-M Supporter - Gold Member
H-M Supporter Gold Member
Joined
Jul 2, 2014
Messages
7,409
You might start out by checking out these companies, just the start of looking at this search: "surface plate calibration east tennessee"

 

middle.road

Granite Stoopid...
H-M Supporter Gold Member
Joined
Apr 28, 2014
Messages
3,451
Strange how Google works sometimes.
I had done the almost the same syntax, but I had inputted 'East Tennessee surface plate calibration service'
Neither Optimal nor Certified showed up. J.A. King did though, they're one of the two that I submitted a request to.
Doesn't look like there are any in the Knoxville area, though there is one up near the Tri-Cities, but they don't list surface plates on their site.
Perhaps I'll get lucky and find a service out of Nashville or Chattanogga that combines trips.
Of course first, I have to get the one(s) I'm keeping mounted properly and not on a dollie.

Here's a funny one. I was checking out one service that came up in searching and here's their list:
  • Threaded Ring Gauges
  • Dial Indicators
  • Optical Comparitors
  • Snap Gauges
  • Depth Gauges
Comparitors? :confused 3:


You might start out by checking out these companies, just the start of looking at this search: "surface plate calibration east tennessee"

 

Janderso

Jeff Anderson
H-M Platinum Supporter
Joined
Mar 26, 2018
Messages
3,986
How did the Egyptians create giant flat one piece stones? They must have used the three rock method (Flintstones)
Or had help from ET.
There was a Youtube on the 3 plate method recently.
 

middle.road

Granite Stoopid...
H-M Supporter Gold Member
Joined
Apr 28, 2014
Messages
3,451
This had to have been a fun gathering:

You might start out by checking out these companies, just the start of looking at this search: "surface plate calibration east tennessee"

 
It can take up to an hour for ads to appear on the page. See our code implementation guide for more details. If you already have Auto ad code on your pages there's no need to replace it with this code
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock