I will be re-adding some iOS options (probably in another thread)... stay tuned!!!
Calculators are now in this thread... Topic: iOS Calculator Options for Setting the Sharpening Angle on Knives... (https://forum.tormek.com/index.php?topic=4373)
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CB, your T4 distance between USB top and stone surface s = 91.80 mm is consistent with Dutchman approximate formula, the exact value is s = 92.21 mm.
Similarly, your T4 distance between USB top and Tormek casing h = 165.17 mm is in very good agreement with the exact value h = 165.76 mm.
Jan
Quote from: Jan on June 17, 2018, 03:00:49 PM
CB, your T4 distance between USB top and stone surface s = 91.80 mm is consistent with Dutchman approximate formula, the exact value is s = 92.21 mm.
Similarly, your T4 distance between USB top and Tormek casing h = 165.17 mm is in very good agreement with the exact value h = 165.76 mm.
Jan
... which translates to < .5° ;)
I put in the spreadsheet a "minimum accuracy of +- 1°". My .02... with all the dynamics involved, that's a fair (maybe conservative) estimate. I like the calculator approach for two main reasons beyond the accuracy... it's consistent, and it eliminates the factors involved in using the AngleMaster... (blade grind angles for example). I think overall though, the calculator concept is a more accurate approach.... (and I include Dutchman's tables in this approach).
A scale diagram gives another source of checking....
(https://forum.tormek.com/index.php?action=dlattach;topic=3631.0;attach=2328)
...(which has the potential of being the most accurate). ;)
CB,
Your diagram makes me aware of a needed tweak in the kenjig. The usb sits in a square area at the top of the groove. This causes an offset in the jig amounting to the radius of the usb. If I drill a 12mm hole in the top corner of the groove for the usb, that will move the measuring point over to the center point of the usb. Perhaps I should move the hole further in to a point where the center of the bottom measuring flat lines up with the center point of the usb.
Thoughts?
Ken
Quote from: Ken S on June 17, 2018, 05:53:27 PM
CB,
Your diagram makes me aware of a needed tweak in the kenjig. The usb sits in a square area at the top of the groove. This causes an offset in the jig amounting to the radius of the usb. If I drill a 12mm hole in the top corner of the groove for the usb, that will move the measuring point over to the center point of the usb. Perhaps I should move the hole further in to a point where the center of the bottom measuring flat lines up with the center point of the usb.
Thoughts?
Ken
So, for reference, I added a Kenjig to the diagram...
(https://forum.tormek.com/index.php?action=dlattach;topic=3631.0;attach=2330)
When I measure with the calipers, I use the corner of the base that touches the stone ('A' for reference in the diagram). This, to me, is the most "direct line". So placing a Kenjig in this manner, it measured a difference of .15mm (92.50 vs 92.35 in the diagram). Close enough for
government...er... MaBell work. ;)
I didn't put it in the diagram, but measuring with the Kenjig "flat" or the center of the part touching the stone, adds around 1mm. So not a lot of difference that I can tell. So there's certainly a valid point to your observation, (especially moving the point to "center" with the bottom of the Kenjig), but I think measuring to corner 'A' would be pretty accurate... and consistent. (I don't think it's really an offset error of 6mm... if that were the case, it would show pretty obviously in sharpening).
Quote from: cbwx34 on June 17, 2018, 04:20:44 PM
... which translates to < .5° ;)
I put in the spreadsheet a "minimum accuracy of +- 1°". My .02... with all the dynamics involved, that's a fair (maybe conservative) estimate. I like the calculator approach for two main reasons beyond the accuracy... it's consistent, and it eliminates the factors involved in using the AngleMaster... (blade grind angles for example). I think overall though, the calculator concept is a more accurate approach.... (and I include Dutchman's tables in this approach).
CB, yes, I agree with you. Your USB height calculator allows to set the bevel angle with an accuracy better than 0.5°, which is sufficient for almost all Tormek users. :)
CB, you are very humble person, because as far as I know, you have also the exact formula in your portfolio. It seems to me that you are feeding us with milk, like children, though you have also solid food for the mature. ;)
Jan
Quote from: Jan on June 17, 2018, 08:59:13 PM
CB, yes, I agree with you. Your USB height calculator allows to set the bevel angle with an accuracy better than 0.5°, which is sufficient for almost all Tormek users. :)
CB, you are very humble person, because as far as I know, you have also the exact formula in your portfolio. It seems to me that you are feeding us with milk, like children, though you have also solid food for the mature. ;)
Jan
Haha... that's pretty funny. ;D But this has been "battle tested" and works... ;)
CB: Thanks!!! This is very handy.
Would it be an easy change to have the calculated distances reported in mm, instead of inches?
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Honestly, what's the practical use of all that?
iPhone owners use an easy and free online calculator available from Rich Colvin: http://sharpeninghandbook.info/indexCalcProj.html (http://sharpeninghandbook.info/indexCalcProj.html)
Your add-on is like building your own cockloft on the roof of a skyscraper.
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Play nice, children.
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I could not resist reacting, but reading from a table is really much faster 8)
Dutchman,
I agree.
I think of our options in setting up knife bevels as a machinist cutting threads. For special jobs involving specific fits or non standard threads, the thread cutting metal lathe is the undisputed first choice. I think of the applet this way. For very precise and/or unusual bevel bevel angles, the applet has no peer.
If I need to thread a drilled hole for a Tormek accessory modification using an M6 thread, It is much quicker to use a thread tap. If I am sharpening kitchen knives with a standard 15° (30° combined) bevel angle, I reach for my kenjig, which is totally based on your grinding tables. Your tables, based on trig principles, once understood, are very fast to use and produce consistent results.
Incidentally, your tables, used with or without kenjigs are certainly not limited to knives.
I have Wootz' applet loaded onto my laptop. It is well designed and easy to use. I think of it as my artillery, ready when needed. For my everyday sharpening, my kenjig is always in the top drawer of my work station. That humble looking piece of Baltic birch plywood has your tables as a basis, very solid math. It is nothing to look at. It is also a very efficient and accurate tool. I would not be a happy camper without it.
Ken
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CB,
I am quite pleased to have this iOS calculator available. Now I don't have to have my computer in the shop, near my sharpening work, just my phone, which is in my pocket just about 24/7.
Rick
Quote from: RickKrung on July 02, 2018, 06:10:06 PM
CB,
I am quite pleased to have this iOS calculator available. Now I don't have to have my computer in the shop, near my sharpening work, just my phone, which is in my pocket just about 24/7.
Rick
Thanks! ;D
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Why not just use the Numbers spreadsheet native to iOS? It works close enough to Excel you should have no problems doing basic Cosine rule types of calculations.
Quote from: Hohn on January 21, 2019, 08:14:12 PM
Why not just use the Numbers spreadsheet native to iOS? It works close enough to Excel you should have no problems doing basic Cosine rule types of calculations.
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Quote from: cbwx34 on January 21, 2019, 06:12:45 PM
The "calcapp" calculator company that I used to host the calculator on the cockloftsoftware webpage, is moving out of beta to a paid plan... so as the ol' saying goes, it has "gone the way of the dodo". ;)
I could continue the calcapp calculator under some paid option, but I have found that the GoCalc option referenced earlier HERE (https://forum.tormek.com/index.php?topic=3631.msg23998#msg23998), has become the one I use the most anyway... and has become the best option I think, for iOS users.
Android users still have wootz programs (http://knifegrinders.com.au/11Shop.htm) available of course, and Rich's Online Calculator (http://www.sharpeninghandbook.info/indexCalcProj.html) is also there, that can be accessed from any web browser.
Just thought I'd let everyone know! :)
CB,
This really makes me sad. What a great tool we're losing. Thank you for moving us forward.
Kind regards,
Rich
A bit of good news... "calcapp" has agreed to allow my little calculator to continue for free... since it's a small program, and I have no commercial interest. So thanks to them, it's back!
Knife Sharpening Angle Calculator (https://connect.calcapp.net/?app=qq0pg0#/)
I have revamped it a bit, and it now only shows results for measuring to the wheel. This makes it more "universal" (it will work with the USB in any position). It also has a better "Instructions" page. (It also gives answers in both mm and inches, 'cause that's how I use it :) ).
The app is web based, which means it'll run on any platform (it is essentially a web page). If you know how, you can add it to the homescreen on a phone or tablet, and it will run as an app, even if you're not connected to the internet (it does have to run one time connected).
So, hope it's a benefit, and thanks to calcapp for letting it continue! :)
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CB, thanks for your effort to make your little calculator available for us. I like it because it is free and it is so easy to use. :)
I have verified the results of your Knife Sharpening Angle Calculator, comparing them with my results. I can confirm, that your calculator works correctly. :)
Your "top of USB to stone" distance is systematically by some 0.01 to 0.02 mm smaller than my distances. This is negligible difference for sharpening practice.
I do not think the difference is caused by rounding. I guess it may be caused by some minor approximation in your math/geometrical approach. ;)
Jan
Quote from: Jan on March 18, 2019, 08:41:41 PM
CB, thanks for your effort to make your little calculator available for us. I like it because it is free and it is so easy to use. :)
I have verified the results of your Knife Sharpening Angle Calculator, comparing them with my results. I can confirm, that your calculator works correctly. :)
Your "top of USB to stone" distance is systematically by some 0.01 to 0.02 mm smaller than my distances. This is negligible difference for sharpening practice.
I do not think the difference is caused by rounding. I guess it may be caused by some minor approximation in your math/geometrical approach. ;)
Jan
Thanks... appreciate you taking the time to check! :)