Turning a Pair of Gear Blanks for a Reed-Prentice Metal Lathe 

Good to see good things happen to good people

*hyped*

I'm hyped up for gear cutting and 100k

George Swindoll J

Mike Davis ???

The ends of the little shaft are fairly critical. The fit for the hole in the gear blank matching the journal it goes on is fairly critical. The diameter of both gears is fairly critical. He's not building a space shuttle. :)

DSCKy that's what I get for trying to make a joke via the comment section

old things didnt tend to use sub 10ths thou clearances and repeatability cars used to need running in and were tight, modern ones not so, keith tend to work on 50-100 year old industrial stuff, which a thousand in the right place is eeough, not every measurement of an item IS that critical, but bearing surfaces usually are, but other parts are clearance, and dont touch anything

DSCKy, on that subject, I commented about the possibility that the ends might in fact be metric to fit a ball race (0,591" is as near as dammit = 15mm) and therefore would need to be exact and not have a bit added for wear, but it seems to have been deleted, oh well....

*??? help, i am not a machinist whatsoever. What are you pointing out?*

@@RobertFay Gears are used in pairs. The mating gear (it's been 2 years since I watched the video and am not going to go through it again) has to have damage. It won't be just wear if the teeth have ripped off the gear he's remaking.

They usually have a hole and are fitted around the workpiece so they can't come off, though it might rattle a bit if it cam loose

Indeed

@@meyawabdulaziz3863 Believe it or not the mating surfaces are fine.

@@cannon440 awesome

SHOPMASTER/SHOPTASK Registered i

This is why people send him such nice stuff!

I can't speak for anyone else, but I imagine most people who do send him projects also aren't in a huge hurry, understanding that other things may come up that require his more immediate attention.

I'm just wondering why "machinists" with "problem machines" are viewing all the machining "how-to" videos by dozens of different "celebrity RU-vid machinists" and why they need to send their "work" to another "machinist" to have things done for them and how they know where to "ship" their "projects" when the "RU-vid celebrity machinists" who claim to have "viewers" sending them things right and left don't publish their addresses on their channels or in their videos. Sounds like a bunch of bullshit to me.

All RU-vid "celebrity machinists" are "swamped with work" but just not enough that they don't have tons of time for "special projects" from "viewers" who are supposedly "fellow machinists" and never run short of time to make their weekly videos but also never seem to have actual work from actual "walk-in" paying customers to show in their videos. And they have AMAZING "fellow machinist" viewers who buy things they don't need at "flea markets" and "garage sales" and on "eBay" and then graciously "donate" them to their favorite "RU-vid celebrity machinists". And usually JUST IN TIME for a "how-to" video. That's REALLY common among the "RU-vid celebrity machinist community" where being a "member" must have its "privileges" and come with amazing "good fortune" to have "comrades" who run around buying things they don't need and somehow magically know which "comrade" DOES need or want them for a video of their own. I don't personally know any machinists or mechanics or electricians or plumbers or HVAC repairmen or welders who have so much "spare time" and "disposable income" they can put hours per week into "how-to" videos and shopping for unneeded/unwanted tools to "donate" to their "fellows" in the trade or who would want to spend their "free time" in the shop where they spend well over a third of their lives anyway or who throw "disposable income" at more tools and particularly used tools from "flea markets" and "garage sales" when MOST "mature" trades people who have been "in the business" for many years on up to decades usually have pretty much everything they want/need by the time they have much "disposable income" to play with and its pretty much only AFTER they've purchased everything they want/need that they HAVE "disposable income" period. And most "tradesmen" who are interested in "educating" aspiring trades people and "passing on" or "passing down" their "surplus" tools and materials tend to do that passing to "rookies" and "amateurs" rather than other "professionals". Most of these "professionals" playing "expert machinist" on RU-vid are "educators" alright. Shop class teachers of some sort or another and with all kinds of "theoretical" knowledge and enough "experience" to have gotten their "teaching gigs" even if it just meant bullshitting "administrators" and with no doubt a "steady supply" of "surplus" and "scrap" equipment and materials that just happens to "follow them home" from WORK. The only "blue collar" professionals that put in a "work week" in the "shop" and just can't help going back for more at "home" are the ones that may have "formal education" and/or "training" in a technical trade but sort of "forgot" to actually leave the "education system" and have been "learning on the job" on the taxpayer tit doing "government work" ever since. When you have "professionals" happy to take "freebies" from "viewers" and those "freebies" are pretty expensive and in many cases "rare" or "unusual" machine tools they bought without needing and "selflessly" volunteer to do "work" for "viewers" that magically know where to "mail" their "projects", you probably have a bunch of "sticky-fingered" government-employee "educators" or "administrators" or "engineers" at a university, technical college, "national laboratory" or other "government facility" that have regularly raided the "surplus" and "scrap" equipment, tools and materials "inventory" on their way "home" for the night/weekend and have been "tooling up" and "stocking up" their "home shop" for years or decades and at some point after "going public" on RU-vid and who knows what other internet "social media" sights realized the "general public" can and does access RU-vid and other social media sights and can even use computers and do Google searches for "government employees" with seemingly endless amounts of free time and expensive tools and materials in their "home shops" they just can't shut up about in their "how-to" videos and had "Uh-oh" moments when they realized at SOME POINT they might just have to "account" for the "origins" of all that expensive, heavy, bulky, special, rare and expensive "hobby equipment". Those nifty little cutting inserts they all seem to have "laying around" by the dozens can go for $10 to $30 a pop and that's the "cheapest" consumables you'll see these "blue collar workers" going through as they "work" in their otherwise "empty" home/personal machine shops full of tools and materials and supplies they apparently "acquire" needed or not and apparently "just in case" an actual "customer" ever comes in and wants to pay them for their services. Of course the other odd thing about these "professionals" is the way they can be "working in the shop" for anywhere from 30 minutes to an hour or more and not ONCE in ANY VIDEO EVER get "interrupted" by a RINGING PHONE or "VISITING" CUSTOMER. Just try to forget that as "government employees" they're pocketing more money than the "average worker" and get a freaking pile of "holidays" and big fat pension and premium health insurance usually including dental and vision and all kinds of other "bennies" BEFORE they get to raid the "surplus" and/or "scrap" tools/materials and no doubt use significant amounts of their "downtime" at "work" as well as taxpayer-provided "devices" and internet access and probably the "services" of OTHER "government employees" to "catch up" on their "work" from their other "jobs" like making RU-vid videos, ordering "swag" to distribute among the other "celebrity machinists" on RU-vid, posting all their highly important "social media" content to Instagram, Facebook etc. and of course "shopping" on eBay for tools they don't need/want they can "donate" to their "fellow machinists" to keep the whole "gravy train" and "wall of silence" up and running lest somebody not get his "swag" from his "brothers" and turn "whistleblower" or something when eventually somebody figures out just what REAL "connections" besides being "fellow machinists" all these "professional machinists" who all seem to have the same "playbook" and of course black books with each other's addresses and personal info in them have that's "bonding" them together so tightly in words, deeds, hobbies and even their "charity work".

Maybe, but it shouldn't wear out for another 50-60 years?

yep it will last another 60 years, let someone have the job then!

I grind things a little different than you did. I grind between dead centers. I think it's a little more accurate. It is by far my favorite way to grind. Where I worked we had a gage pin that had a engineering change . The pin needed .0002" taken of it . Their gauges had to be ground to the high limit. + or minus nothing. The tolerance was the wear of the gage . The day shift forman thought it was a joke. I told him give me a shot at it. The centers in both ends were recessed to protect them from damage. I first put it between centers . With a tenth indicator it ran dead "0" at that point I knew I had a chance. Long story short I did it. But if not for the good centers I wouldn't have a chance. I use carbide tipped centers they hold up much better. Your choice on the steel for the smaller one was good. It takes lot more abuse than a larger one. I can see that on a lot of the machines you work on making new parts is your only option.

Joel Kernel that's exactly what he said, it means it was to the exact size. If he said on the money and change it would mean it was oversized by the " Change"

He did say that he was going to finish it between centers.

Doh, i didn't get to the end!

10:58

thought the same! this leblond lathe have straight toothing on the gears, i think.

CaptAndy Yes it sounds like a cement mixer. Keith damaged the new motor bearings when he replaced them. He also dangerously overtightened the new belts so I suspect those noises are not good news for the lathe.

number of teeth plus 2 divided by the pitch circle diameter will give you the blank od

OD = (N+2) / DP so for 12 and 40 teeth in Dimetral Ptch 14 (I think he said) we have (12+2)/14=1" and (40+2)/14=3"

He never answers RU-vid comments. You do realise that grinding wheels are convex, hence they grind things "concave"?

i think its his air conditioner, there usually IS a steam engine running when hes at the museum, whistle and all

I think it's the main motor for the lathe

dejanira2 it’s a calculated diameter not measured , based on the tooth count and DP or mod

because a cast iron have a lot of graphite in his structure and this is a lubricante, like a pencil

cast iron doesnt make chips it makes iron dust, iron dust and oil = abrasive compound

dejanira, congratulations ol'sport . you might have won a bag of swarf and cuttings if you ask Keith nicely.

The camera is not a fan of having chips machine-gunned into its lens.

JL Software Solution: UV filter.