Cross drilling - what is it?
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- Опубліковано 1 лют 2025
- Many have heard of 'a cross-drilled crankshaft' but still don't know what it means - hence the video.
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I don’t know why people don’t understand that you’re just explaining it so most of us that aren’t professional engineers can understand the principles of it. Some people hang on everything that you say to try and criticise. I just watch and enjoy learning enough for what is interesting and not because I’m going to cross drill my crank. Great video I think.
"Some people hang on everything that you say to try and criticise"
- its the internet dude - shit happens. It is also a good thing - when people mention these things it help me choose subjects for future videos.
Dell's daytime job is centre punching those cranks so that the CNC machine can drill accurate holes in them.
brass ball bearings and the passages which haven't been drilled on carbs were always a mystery. thx a lot for explaining it 😊 love your videos ❤ keep it up.
Always wondered what them ball bearings jammed in holes were, seen them on many brake slave cylinders, couldn't figure them out and now I do, good job lad!
Never really thought about what all those ball bearings were for but damn man I am going to make sure I tell someone. I’m sure they will be impressed. Thanks for the knowledge bomb.
thanks buddy god bless you, i've been searching for days now and nobody explained this, and it was annoying me all night
it's ridiculous just when i was going to sleep my brain was like: "but how they lubricate the journals" and there i am waking up and starting to search and finding nothing😆
thank you again brother
A very good video, 😊 🙏
Thanks Matt, I'll use this a a conversation opener down the leigon this weekend and bamboozle them with my new found knowledge on cross drilling and galleries, they'll either buy me a pint or give me a smack lol, great video, always wondered how they did it but couldn't be arsed to find out, ta mate !
The video of the drilling at 2:00 shows the gun drill entering in through the webbing adjacent to the pin. You explain it at 2.33 as it going directly to the big end pin.
These are 2 different ways of drilling the oil passage ways through a crank. The one in the video requires additional holes drilled across the pin (what i refer to cross drilling) that intersect the first hole. Then having the entry to the first hole plugged.
The way you are describing at 2:33 is straight shot gun drilling and that has the entire hole made with just one straight line hole. This not only is a easier path for the oil to make it to the big end. It also changes the oil phasing by altering the position on the pin where the oil exits the crank. But it is alot more difficult to achieve a precision gun drill over a longer distance.
I am putting together a subaru engine at the moment and the OEM crank has the multi stage holes. But i have a new billet de-stroker crank and it has straight shot holes.
The video of the drilling at 2:00 shows the gun drill entering in through the webbing adjacent to the pin. You explain it at 2.33 as it going directly to the big end pin.
- these are just example of what the process is designed to do, not the exact path.
Blokes that use Chinese drill bits are often cross drillers.....
Really good that matt honestly did not know all that. Have you told Del so he can tell his gang ????????? Also what is
a riffle drilling is it just straight down ???
Plans of videos about other methods for crank oiling? Like nose fed, pros and cons of each design?
Matt, the cross drilling is pretty straight forward to understand, but how the hell do you bleed that sort of system? Air bubbles in oil galleries have got to be a bad thing.
These are forced out - the system is open to the air - more on this later - but good question
often wondered about the ball bearing too, now i know, thanks
now that was very interesting thanks
did you see the amount of 303 pissing out of that cnc machine -- will make that crank invincible
Liam it was fs365 got to stop that shit rusting :)
No is 50/50 to make it super super super slippery
Amazing video realy..
Always amazed by your whiteboard skills! I assume the Left Hand threads were on purpose? :) (For some reason "backwards" threads always catch my attention.
I want it Del
A great explanation of lubrication but terminology is key. The diagonal drilling you drew is not cross drilling as I understand it. Non " cross drilled" cranks have that channel. It's the only way you can get oil to the big end journals, which after all are spinning well away from any central oil source. Cross drilling refers to diametral drilling across either main or sometimes big ends with the theory that if there are two exits for pressurised oil during rotation the opportunity for lubrication is doubled. Such cross drilling is not the "silver bullet" to lubrication since in one half the oil has to overcome centripetal force. Further, such cross drilling causes aireation of the oil and induces weakness in the crank shaft. Cross drilling is often used in conjunction with grooved shells to distribute the oil and theoretically allows the use of plain bearings on the bottom which are perceived to have a greater load capacity. This is subject to debate since the load is actually reacted by the oil film normal to the load and not necessarily to the apparent surface area of the shell surface nearest the journal.
What you say is absolutely correct in how to lub bigends but it's all about terminology.
Cross drilling is when holes that are drilled cross, hence the name
Oiling to an engine is as important as your blood flowing to parts of your body. Some get it right from the design stage, some just try to fix what was never right.
Hay Mat, off topic I was of the school that the adds playing before your videos are for monetary means for both you and you-tube. So when I want to support a Ch. when I see the add at the beginning I click it. My thinking is that this will in a very small way add moneys to "The Workshop" Ch. is this right?
Good question - I don't know - I'll find out
I have tried to drill Delboy for some information on this, but he just gets cross. I thought that was cross-drilling. Just goes to show, every day is a school day.
Who's first matt, you have to tell us
Just as my cheeks hit the porcelain
theres the toilet seat for that you dirty fuck. Who sits right on the porcelain?
didn't see ya rub out the wrong colour matt how friging clever was that sorry carry on !!!!!!!!
Intro song please:)
With all of this knowledge why do you not teach at some school?
School of UA-cam
carbs are made with these cross drillings
I say this in the video...
T
You are LOL
joshua langley thank you, thank you 😌😎
... still using a carb to get the juice to vapor? LOL!
First