I'm a NOB, this is my first post so any help would be appreciated.
I just received my Colvin FVB and installed it on my T8.
I am using the USB Calculator on the Calcapp and cannot get my numbers to match what is shown on the last page under the "Tormek Constants" for the Colvin Tools FVB Horizontal and Vertical measurements.
I am going off how I am interpreting the drawings on where to measure on the 3rd page under Instructions and Machine Variables.
For Horizontal the list on the last page shows 133mm for the Colvin FVB and I measure 137.5mm.
For Vertical the list shows 54mm for the Colvin FVB and I measure 42.5mm.
Does anyone else have a T8 and the Colvin FVB that could verify my measurements or the measurements in the table of the Calcapp?
Anyone have any ideas that might steer me in the right direction?
Below are where I am getting the examples of where to measure and what the measurements should be.
I realize they are examples only, but my measurements are way off.
I apologize if this has already been addressed.
Any assistance would be very much appreciated.
FVB_1.jpg
FVB_2.jpg
Quote from: gbeaklr on March 26, 2023, 12:58:18 AMI'm a NOB, this is my first post so any help would be appreciated.
I just received my Colvin FVB and installed it on my T8.
I am using the USB Calculator on the Calcapp and cannot get my numbers to match what is shown on the last page under the "Tormek Constants" for the Colvin Tools FVB Horizontal and Vertical measurements.
I am going off how I am interpreting the drawings on where to measure on the 3rd page under Instructions and Machine Variables.
For Horizontal the list on the last page shows 133mm for the Colvin FVB and I measure 137.5mm.
For Vertical the list shows 54mm for the Colvin FVB and I measure 42.5mm.
Does anyone else have a T8 and the Colvin FVB that could verify my measurements or the measurements in the table of the Calcapp?
Anyone have any ideas that might steer me in the right direction?
Below are where I am getting the examples of where to measure and what the measurements should be.
I realize they are examples only, but my measurements are way off.
I apologize if this has already been addressed.
Any assistance would be very much appreciated.
Hi:
Any chance you could snap a photo or two of how you're measuring?
I double checked and the measurements in the chart match what I'm getting. (But to be fair it's my chart.) But it also matches what is on the ColvinTools website. (https://colvintools.com/Tormek-FVB-Calculators.html) I'm not sure if anyone else has provided them.
Pics would help. :)
Here's a picture I took the other day showing how I made the horizontal measurement. This is on the T-4, but the process is similar. Insert the USB into the bottom of the FVB and take the measurement. (Take the total and subtract 12).
T-4Msrmnt.jpg
For the vertical, you can measure from the top of the FVB to the top of the casing, (I place a ruler on the FVB over the casing and measure the gap and add 29... should get you pretty close.)
Thank you for the clarification.
I am now in the ballpark with 138 Horizontal and 52.5 vertical.
I was measuring all kinds of wrong!
Horizontal.jpg
Vertical 1.jpg
Vertical 2.jpg
Thanks for pointing me in the right direction!
Quote from: gbeaklr on March 26, 2023, 05:11:25 AMThank you for the clarification.
I am now in the ballpark with 138 Horizontal and 52.5 vertical.
I was measuring all kinds of wrong!
Thanks for pointing me in the right direction!
Unless Rich made a change to the FVB dimensions, I'm not sure there should be that much of a difference.
The easiest way to check is to set the USB using the USB to FVB measurement, and then, without moving the USB, measure the distance from the USB to the Honing Wheel. It should match what the calculator says for the USB to Honing Wheel.
CB,
Thank you for the input. There have been no changes to the FVB's design, so I assumed that your assistance was needed, and indeed it was.
Kind regards,
Rich
I can double check my new measurements again this weekend.
Thank you for the assistance gentlemen!
Regards,
Gary
I verified my measurements and am confident that my Horizontal measurement is correct at 138mm.
The measurement from the top of the FVB to the top of the motor shaft is 45.25mm. Add 6mm for half the motor shaft and I have 51.25mm for Vertical.
These are the measurements I record and are repeatable as I perform them.
Vertical 3.jpg
Regards,
Gary
Here is another method to get your measurements. In the text there is a "Download here" to download an excel file.
https://forum.tormek.com/index.php/topic,4968.0.html
I will check into that method when I have some time to play with it again.
Thank you.
I have some indirect evidence as to why this occurred. Until I get the needed evidence to prove or disprove it (you know who you are), ;D my current theory is that the horizontal measurement is based on the time zone it's set in. Beginning in the Eastern Time Zone, subtract approx. 1.67 mm for every time zone as you travel west.
(Don't measure on the day the time changes either way.)
(If you're in Sweden just use the AngleMaster.)
:D :D :D
Quote from: cbwx34 on March 27, 2023, 11:04:09 PMI have some indirect evidence as to why this occurred. Until I get the needed evidence to prove or disprove it
...
Do not sharpen your knives in this condition. You could hurt yourself! ;)
Quote from: cbwx34 on March 27, 2023, 11:04:09 PMBeginning in the Eastern Time Zone, subtract approx. 1.67 mm for every time zone as you travel west.
Is that valid for the entire time zone ? For each 15° of longitude ? Right in the middle ? Should we extrapolate when we sit close to the edge of the 15° zone ?
Quote from: cbwx34 on March 27, 2023, 11:04:09 PMI have some indirect evidence as to why this occurred. Until I get the needed evidence to prove or disprove it (you know who you are), ;D my current theory is that the horizontal measurement is based on the time zone it's set in. Beginning in the Eastern Time Zone, subtract approx. 1.67 mm for every time zone as you travel west.
(Don't measure on the day the time changes either way.)
(If you're in Sweden just use the AngleMaster.)
:D :D :D
I'm happy to live in Sweden.... avoids all this calculation ;)
;D ;D ;D
Thanks to everyone for the Awesome support!
This is a great source of information and I really learned alot thanks to everyones input.
Many Thanks!
Gary
While I had already done some "crazy" with a ruler to test my theory...
CT difference480.jpg
... Rich was kind enough to send me a (what I will call) "production" model to compare directly.
What I found is that there is a 3.5mm difference in the location of the holes where the horizontal rods are inserted. This causes the the production model to sit lower, so that it contacts the machine at a different point.
Long story short, the production model constants I measured match what gbeaklr measured: 138mm horizontal and 51mm vertical. (A T-4 I measured as 114mm and 39mm.)
Good lesson in why it's a good idea to measure your own setup!
p.s. Thanks Rich!
If you just use the distance from the USB to the grinding wheel surface, all of that goes away...
I have never understood the need to measure using anywhere except "from the USB to the surface of the grinding wheel". I borrowed this from Dutchman's work and applied it to the kenjig. It simplifies measuring.
Ken
Quote from: Ken S on April 02, 2023, 04:30:09 AM... snip
It simplifies measuring.
Ken
... and it reduces tolerances ;)
While I personally prefer the ease and versatility of measuring to the wheel, I decided to provide the alternative in the Calcapp app to those who want it. Many like this method, and I've found it works just as well.
I've also found that it's not necessary to try to take constant measurements to .XX accuracy, or needing to measure out .X° differences, so it's not that difficult. Notice that all my "constants" are to the nearest mm, and not like when we were debating, "Was that 49.38 or 50.12?" I found that flipping the USB over that I showed earlier, (and gbeaklr's idea for measuring the vertical) are quick and easy measurements to take.
Just like measuring to the wheel, pick a technique that is accurate and consistent, and the results will be the same. Don't get caught up in the minutiae (especially of the past). ::)
cbwx34
Thanks for verifying what a newbie was measuring!
I am Proud to be a Patreon member and love to see that even a newbie has a voice.
This site has been great about not making me feel stupid.
Thanks to everyon that replied.
Results with the Calcapp and these new Colvin settings have been spot on and razor sharp.
Great Job!
Quote from: gbeaklr on April 06, 2023, 04:02:39 AMcbwx34
Thanks for verifying what a newbie was measuring!
I am Proud to be a Patreon member and love to see that even a newbie has a voice.
This site has been great about not making me feel stupid.
Thanks to everyon that replied.
Results with the Calcapp and these new Colvin settings have been spot on and razor sharp.
Great Job!
Thanks! Glad it's working out for you.