Back in the early 60's as a second year apprentice under instruction I made a precision cylindrical square with a piece of hydraulic cylinder ram 75mm diam and 300mm long. The OD had been hard chrome plated and ground. I centred each end using a lathe and running each end in a bronze tipped steady. Finally the piece was run between centres and the end face undercut and faced by grinding across the edge face.......that is as square as you can get it without exception. Due to constrains of security I was unable to take the square with me and so it was left in the workshop tool room as part of the equipment.......one day I will make another one as the method of production and availability of material is so simple.
Hi Stewart, Thank you for the comment. This was one of my first video; s I could have done a better job with the execution. Still It was fun and I got a reasonable square reference for the price of picking through the local diesel shop scrap pile.
Thank you Chris I didn't have the funds for a good cylindrical square and thought about the large wrist pins. Free from the scrap pile at a local diesel engine re-builder
@@W1VLF currently stressed with work.... I did manage to start an on-line training for Ham License here in Germany, don't know if I could follow along due to work... How are things there my friend?
Yes. I would be interested in seeing the lapping process for a tolerance of .0001". I suppose the plate you use would be useless after doing a cylinder or two, no?
Hey paul... can you share the details on that large pin as far as the part number and where it can be purchased.... any information as to where you purchased it would help.. thank you sir!
![[TH] 2024 PMSL SEA W2D5 | Fall | พลาดวันนี้ จะต้องเสียใจ](http://i.ytimg.com/vi/A5-Cuo12p6A/mqdefault.jpg)
Hey Paul, thats the beauty of a cylinder square, they are self proving and are always right in 1 spot!
i need to make myself one
It seems like if the base has no rock, then there must be two square sides 180 degrees apart.
I'm playing with 2 wrist pins right now and you're absolutely right.
Back in the early 60's as a second year apprentice under instruction I made a precision cylindrical square with a piece of hydraulic cylinder ram 75mm diam and 300mm long.
The OD had been hard chrome plated and ground.
I centred each end using a lathe and running each end in a bronze tipped steady.
Finally the piece was run between centres and the end face undercut and faced by grinding across the edge face.......that is as square as you can get it without exception.
Due to constrains of security I was unable to take the square with me and so it was left in the workshop tool room as part of the equipment.......one day I will make another one as the method of production and availability of material is so simple.
your doing fine, hand lapping works just fine, it's the result you have achieved that's fantastic
Hi Stewart, Thank you for the comment. This was one of my first video; s I could have done a better job with the execution. Still It was fun and I got a reasonable square reference for the price of picking through the local diesel shop scrap pile.
What a great idea. Thank you very much!
I like your approach to this 👍🏻 thumbs up from me
Still waiting on that lapping video.
Interesting experiment... looks a good approach to me. :)
Thank you Chris I didn't have the funds for a good cylindrical square and thought about the large wrist pins. Free from the scrap pile at a local diesel engine re-builder
You spent 12 minutes (ably) illustrating a relatively trivial bump gauge measurement but you didn’t show us how you squared the ends. ??
Could you please explain the process you used to square the ends off from the surface grinder etc??
Hello Paul 😊🙂👍
Hello Catalin... How are things on your side of the pond?
@@W1VLF currently stressed with work.... I did manage to start an on-line training for Ham License here in Germany, don't know if I could follow along due to work... How are things there my friend?
Yes. I would be interested in seeing the lapping process for a tolerance of .0001". I suppose the plate you use would be useless after doing a cylinder or two, no?
You correct and re lap from time to time but the geometry isn't always important in a lap
what part numbers could i search on, they don't seem to be listed with dimensions.
Hi Jesse... I don't which one you should actually .. I got mine for free off the scrap pile at a diesel repair shop..
Awesome.
Looks right to me
yep, that's the way I do it. . . .
....also do you know if a larger pin exists.. thx
Hey paul... can you share the details on that large pin as far as the part number and where it can be purchased.... any information as to where you purchased it would help.. thank you sir!
piston/wrist pins for diesel engines on ebay. The come in various sizes. I have an 84x95mm that I got new for about $25
@@juliejones8785 thanks
👇🚾 💪 😂