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This is now available on the Google Play store as well:
https://play.google.com/store/apps/details?id=com.perfectedge.anglefinder

New version 1.2 will be out shortly with the ability to save configurations for different machines as well as numeric keys for entering values.

Hello,
Very interesting.
Can I ask how it compares to (or how it differs from) Calcapp which I use?

For info, I do not have an iphone but use Calcapp on android which I find extremely useful and well thought out for knife sharpening and also chisel/plane sharpening.
One more question if you don't mind...
Why do you have a choice of grinding wheel setting as well as the current diameter setting? Not sure I understand??

Danny

Hi Danny,

I used to use KnifeGrinders App till it got pulled from the app store, I havent found an app on the Iphone app store for this. I've never used Calcapp, and I can't find it in the store so, I'm not sure how it works or how it compares.

The various wheels are for folks who want to have some presets or have multiple machines they work with each with a wheel of a different size, just to make it easy to switch.

-Vijay

Special thanks to @cbwx34 for spotting an error in the calculation! It's fixed, and the update will be out soon!

Note, if you are in Europe, the link may not be active yet on the app store. There is a pending Digital Services Act review in progress.

5/7/2026 Now available in EU as well.

[Link to App Store for Perfect Edge Angle Finder]

Hello Sharpeners,

I've built an app that calculates USB height or knife projection for Tormek-style sharpeners. Dial in bevel angles, wheel size, and machine geometry for repeatable edges.

Currently it's only available on apple (iOS) but if it gets some adoption I'll add additional platforms.

Try it out and LMK if you have any questions.

Link to App Store for Perfect Edge Angle Finder

Link to Google Play Store




 

Yes, I can ship to EU, Canada and a few other countries now - give it a shot on my website. The threads are not the same - I went with a standard (metric) thread vs. the one that Tormek uses (ACME). The iteration I will be producing next will have the thumb cup too! Trying to source a manufacturer at a reasonable cost though is proving to be VERY difficult though, design is done though.

 

This looks like a great solution. Thanks! Especially if you can add that 'friction' to the thread on the adjustable stop to stop slipping.

Yes, I've added an o-ring #3 on the current model (V2) - see blog post on my site.


BTW Version 3 (not yet produced) will move the fixed jaw off the center axis by 1.5mm to enable a perfect centering for a 3mm thickness, roughly the same compromise the SVM jigs made.

I've posted on a couple of other threads, but I've developed a retrofit for the KJ to make it like an SVM. I'm a few iterations in now and am getting it really dialed in, including a friction ring for the knob. Take a look!

https://magnoliaknife.com/blogs/news/tormek-retrofit-blog-post

I've found that just hitting the SB-250 briefly (2-6 revolutions) with a cheap 120/180 grit diamond lapping plate works to redress the grinding surface. This technique also works really well with the SJ-250 though might take more revolutions on that.

Hello all,

We have 3 T-8s and sharpen thousands of knives a year. About a year ago we switched to SB-250s and generally love them. I'm noticing they constantly get out of true on all of our machines (so I don't think it's a problem with our machines), and I have to think we generally apply equal and random pressure as we sharpen - it's not like we press harder every revolution always in the same place. My only conclusion is that they wear unevenly for some reason.

Has anyone else noticed this problem? Every month or two I have to true them up to the tune on 2-4 mm and it feels extremely wasteful. I wonder if there is a manufacturing defect that is causing inconsistent wear. Would love to hear if other's are experiencing/noticing this problem.

Thanks!

I run a knife sharpening business and have developed and produced a retrofit for the KJ-45 to make it more like the SVM because adjusting the height of the bar is very cumbersome when you are doing a lot of knives. We set to 140mm projection and generally keep the height of the bar the same (cleavers are an exception). We micro-adjust on the fly to match bevel angles. We spend VERY little time on setup because of this. I keep thinking I should do a setup time race on 5 or 10 different size knives to show the difference, I'm sure it would be quite significant.

https://magnoliaknife.com/products/tormek-kj-45-adjustable-retrofit

Hi Ken, thanks for the questions.

We set to 140mm projection (sometimes we need to adjust to match specific bevels) but our default is 140mm to get a 20 degree bevel. The height of the USB changes occasionally as the wheel get's smaller - perhaps once a month. We now only need to change the USB for really, really wide knives like cleavers. The retrofit I've made seems to work for even the smallest blades @140mm. As the wheel gets smaller, we may need to go back to a two USB system for now we can leave it set at about 175mm for a 250mm wheel - it obviously changes as the wheel gets smaller. The smallest wheel we have currently is 225mm and it's still working.
I measure the wheels and use the Grinding Angle Setter for Tormek app to calculate the USB height every few weeks and post a 140 & 130 projection height for my staff to reference.

Update: We've been using the retrofit for a couple of weeks now. We no longer need to adjust the height of the  USB because we have the additional span of the shaft. We haven't found any issue yet with having a longer shaft other than it makes our work easier. The standard threads are tighter than the acme threads on the original and the fit is a bit looser. This makes for fast adjustment against the wood block we use to align. My employees are very happy since this speeds up their work and they are commission based per-inch. We did a farmer's market and never had to change our USB height the whole day! We sharpened over 100 knives.
In any case, we are pleased. One improvement in the next production run will be to add 5-10 mm of threads at the lower limit to account for even wider knives and perhaps chamfer the end of the adjustment knob more for comfort. The all aluminum construction also seems to be self-lubricating against the USB, only concern there is wear...

Hi folks,

I've developed a retrofit for the KJ-45 to make it more like the SVM. If you, like me are frustrated with the KJs, take a look! I also made the shaft longer and used a standard vs ACME thread.

https://magnoliaknife.com/products/tormek-kj-45-adjustable-retrofit