making an ID lapping tool

[@Topsworkshop]

Harald, 5 stars on this one! you should definitely do more of these, I think a lot of us are more interested in "how" you do stuff, than just watching them go, I love watching machines work but your setup and process is so much more valuable, thank you!

[@HaraldFinster]

Jason, thank you so much for your kind comment. I feel really honoured. Honestly: I often skip over the setup and measuring procedure for two reasons: I am afraid of boring the viewers and the difficulties of setting up the camera for this kind of scenes. Surely I am at the very beginning of my learning curve. The next project is in progress: I am currently working on a hobber for a worm gear wheel. The basic principle will be the same as shown here kzbin.info/www/bejne/pofQpZ6aq5mgjbM but with a way more sophisticated setup. It takes a lot of time as I have never done anything like this before and have to experiment quite a bit. Filming the process in parallel makes it even more challenging.

[@Topsworkshop]

@@HaraldFinster Harald I would encourage you to add the setup stuff. Let's be real, the people who are watching these videos are the ones who want to know "HOW" your doing it, already "Gear Heads" don't sell yourself short these are terrific!

[@Machine_NZ]

Hi Harald, thanks for making this video and showng the process of how it was made. Cheers Kevin

[@doncarr912]

Thank you Harald for the information which you provided on the taper of the taper arbor. This information is very difficult to find as most people do not include any information on this aspect of the lapping tool.

[@bambukouk]

There is absolutely nothing wrong with your English and I prefer real human voice - thank you!

[@marcostavares7293]

5 start english , Very nice work, Thank´s for sharing.

[@James-fs4rn]

👍 looks like some fine German engineering.

[@HaraldFinster]

Thanks! However, the basic idea is actually from the Swedish company SKF 🙂 (AFAIK)

[@HaraldFinster]

This is my first attempt to use spoken comments instead of subtitles. I appreciate your feedback: do you prefer my bad simple English or should I stick with the captions?

[@kundeleczek1]

You english is very good, I like you lapping Tool.

[@HaraldFinster]

@@kundeleczek1 Thank you very much, Artur - also for your subscription!

[@jackk7030]

G day Mate 👍👍👍 Please keep on talking Harald it was a great video, you had me glued to the screen, All the best to you and family Stay Safe Cheers 🥃🥃

[@mftmachining]

Erstklassige Arbeit.

[@deanfranks8242]

American English speaker you're more than capable.

[@WILKSVILLE]

Xlent.

[@doncarr912]

Harald: Can you tell us what degree of taper are you using on the taper arbor?

[@HaraldFinster]

Don: thanks for your interest. The larger diameter of the cone is 23.0 mm (0.905") , the smaller diameter is 20.4 mm (0.803"). The distance between both ends of the cone is 60 mm (2.36"). The (one sided) angle is atan( radius_difference / length ) = atan( (( 23.0 - 20.4 ) / 2) / 60 ) = 1.2412° (is there an imperial equivalent for degrees? ;-) ) Thus the included angle between both sides of the cone is 2.4824° Hope this helps. Kind regards Harald

[@pablodiablo7658]

Amazing, have you ever made any in smaller diameters? Say 12mm? I`m considering it but no idea how to do the internal slots 🤔

[@HaraldFinster]

No, sorry, I have never tried smaller diameters. Edit: you could try a different design: instead of cutting individual slots you could cut a single spiral shaped slot into the lap. I tried this with a piece of aluminum tubing and it worked pretty well: kzbin.info/www/bejne/Z3_HloZmjbWFhaM

[@sto2779]

What is the difference between lapping and honing? Thanks.

[@HaraldFinster]

To my understanding both methods use some kind of abrasive to remove metal from the work. In case of honing the grains of the abrasive material are fixed e.g. in an abrasive stone. In contrast lapping uses abrasive particles which are free to move between the lapping surfaces. This removes material from the work piece and from the lapping tool as well. Thus both surfaces mate perfectly after some lapping action. This results in very precise surfaces.