A MODEL ENGINEERING COMEDY OF ERRORS - PART #2
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- čas přidán 12. 01. 2024
- A Model Engineering Comedy Of Errors - Part #2. This is just about the only part of this video series that went more or less according to plan at first. I am using a 4 Jaw Independent Chuck to drill and ream the ⅜" diameter hole in the Sheave. / keithappleton
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/ @keithappleton - Jak na to + styl
I still like that you show your foibles, as well as your successes. Shows us what not to do first. Then, how to do it right.
They say you learn best from your own mistakes - that's rubbish, I'm learning from your mistakes from the comfort of my living room chair! But really, everybody falls into the trap of "I'll just take a light cut to improve the finish of the already accurately-dimensioned part" once in a while. At least we have some nicely finished bits in our scrap bin.
I have a piece of barsteel that acts similarly to what you used here. I believe mine came from the hardware store years ago and it's just rubbish. You can grind and weld it fine but it sucks at being machined.
I am turning a bearing set in some mystery plate steel my father had stashed. Gummy and odd to bore. Drill swarf would feed out and then start shaving. New cobalt drill bit.
You never know what you have unless to grind on it a bit to see what sparks come off.
Good luck.
Keith, please don't feel isolated. "Cranio-rectal Syndrome" afflicts us all, with annoying regularity. The erasers on my pencils have long since been used up.
I didn't realise that others sawed work pieces off in the lathe chuck, I just thought it was me being a skinflint minimising wasted metal and my general dislike of the parting process!
There wasn't enough space to part off the bar with a parting tool, I was not having a good day ........
@@keithappleton I empathise with the position you found yourself
Could you have cut a grove and then slowly turned the piece, holding the saw to cut off the end?
You would still need to move the saw blade otherwise it would wear in just one place - the method I show is safer. . . . . . . .
One of the more stupid /annoying things I have done in the 'machine shop', (actually just a shed), aside from not being fastidious about wearing proper eye protection and relying on my glasses, was sawing through a work piece and putting a neat notch in the bed of my fathers lathe :0( Only done it the once but it was there to remind me every time I used the lathe.
I always have a small piece of wood nearby ......
@@keithappleton Nowadays I do too!
To scribe a circle, centre punch it then pick up the centre of the centre punch mark to run true in the four jaw chuck suggests to me a not very accurate process.
What I do is either drill and ream a pilot hole in centre of the bar, go to the Mill and with a dowel a few tenths down on the reamed hole size in the Mill chuck, pick up the hole centre, zero the leadscrew vernier wheel then index over using the Mill's leadscrew's vernier wheel to get the offset, then centre drill, drill and ream the hole.
Other way is with the bar OD turned to size, set bar in the independent four jaw chuck approximately the required offset and bring the turning tool to lightly touch the part, read off the number on the cross slide vernier wheel, back off the tool and turn the chuck 180 degrees, repeat the process and subtract the smaller number from the larger. Keep adjusting those two jaws until you get the required offset. Set the other two jaws with the turning tool lightly touching the OD as before but set for zero difference between the two. Using that technique I can get asymmetrically shaped parts with a dia. or hole to be made or cleaned up say, set to run true fairly quickly.
Why go to all that trouble when the way I do it is generally quick and accurate ? I laboured the setup for the video . . . .
Need to find out what this diabolical mystery metal is and mark it for future reference .
I will mark it "BIN" }:-)))
Hope everything is OK, you haven't posted anything in 3 days.
Fine thanks, I don't post much public on CZcams in the first Months of the year as the ad revenue is too low. A video almost every day all year round though on www.patreon.com/keithappleton