third world crank machining, while its certainly not cnc precision its still interesting to watch

[Grumpy]

keep in mind, that a damn good and very experienced machinist ,with good quality tools,
can and frequently will produce a very good quality crank, using similar methods,
but I don't think this shop is going to be one producing a top quality job.
just looking at the lack of cleanliness'
and the way parts measurement's are checked
Id bet some of the bargain CAST crank assemblies you see FOR SALE on places like ebay ,
HAVE COME FROM SIMILAR SOURCES
AS HAS ALWAYS BEEN TRUE, QUALITY TENDS TO COST A BIT MORE

 

[Grumpy]

what you save initially, in lower price ,
will more than likely be made up in the cost of required additional machining and time & effort added in required balancing
you tend to get what you pay for, quality machine work and precision measurement and careful inspection processes take time and that costs money.
there is ALWAYS a compromise, made between quality and price
I learned that long ago,
“Quality is like buying oats. If you want nice, clean, fresh oats, you must pay a fair price.
However, if you can be satisfied with oats that have already been through the horse ...
that comes a little cheaper.”

thats why I generally suggest SCAT rotating assemblies
and having the required precision measuring tools, if you save $400 on the rotating assembly initially,
but need to spend $250 to get it balanced and $250 to get it polished ETC, what have you gained,
especially if its lower quality cast iron vs cast steel in a SCAT crank
remember in most case you still need a flex plate/flywheel and damper and associated bolts/fasteners etc.


related threads
http://garage.grumpysperformance.co...tion-of-crank-durring-short-blk-assembly.852/

http://garage.grumpysperformance.com/index.php?threads/scat-cranks-related-info.10930/#post-74729

http://garage.grumpysperformance.com/index.php?threads/a-few-basic-precision-tools.16344/#post-99006

http://garage.grumpysperformance.com/index.php?threads/types-of-crankshaft-steel.204/

http://garage.grumpysperformance.co...d-rod-orientation-clearance-issues-etc.16027/

http://garage.grumpysperformance.co...needed-for-383-sbc-assembly.16041/#post-96866

http://garage.grumpysperformance.com/index.php?threads/bearing-clearances.2726/page-2#post-87849

http://garage.grumpysperformance.co...g-with-a-local-machine-shop.14419/#post-74383

http://garage.grumpysperformance.co...ore-clearance-on-your-block.14251/#post-72471

http://garage.grumpysperformance.co...haft-journal-surface-finnish.2728/#post-72043

https://www.scatcrankshafts.com/rotating-assemblies/rotating-assembly-product-search/

http://garage.grumpysperformance.com/index.php?threads/precision-measuring-tools.1390/#post-68850

 

[Loves302Chevy]

Wow. That gives a whole new appreciation for doing it the old-school way.
CNC could machine probably 50 cranks in the time it took to manually machine one.
And to a much higher tolerance.