Problem solved !!! When the Gib is rotated from being machined on it's back to it's 60 deg position , the angle changes . Compound Angle . Similar to a 60 deg threading tool . In a flat tool holder it will cut 60 deg , in an inclined tool holder it will not !!!

I'm a simple man Max, and I always look for a simple solution. I would have cleaned the parts well, then superglued and clamped the gib in place, then after the glue had set used the dovetail cutter to lightly skim the gib. Engineers out there are going to hate me for this, but it saves my brain exploding with all the maths. 😊

Great you figured it out, man when things go from geometry to trigonometry I am lost

I know I'm late to the party of the ''Angle of the Dangle'' ! video as I've been busy w/other things. This one had me digging throught my math notes to try & solve. I got it all worked out when I figured out the 0.065 is the hypotenuse of a 30/60/90 triangle. It took me a couple of hours, but it was fun. 👍cheers Max. It is good to see the progress you are making.

was doing the trig maths in my head Max and i came up with 3 apples and a frog, we'll have to compare notes 🤣

Machining can be a hell of a headache, but damn satisfying when we solve the problem. Thanks again mate 👍🇦🇺

nice wprk Max the doves in the background at the start approve of the dovetails as well cheers mate.

Excellent sleuth work Max. We've all been there.

Welcome to my world lol, g'day Max, I've not even watched this right through, but have absolutely no doubt you've reached the solution 😉 Have a wonderful weekend mate

Good Job mate , Soon all the machines will be up and ready!

Smashed that like button on this one, I love to refresh my trig.

Bruce you may not have uncovered the problem, but you have shared a hell of a lot of experience with us looking for it. Watching you use the cigarette paper to find the low spot is excellent information. I keep a pack of papers in my box and use them on occasion for measurements, but I would never thot of the 3-paper method you just demonstrated. Thanks for bringing us along even if it is frustrating for you.

I enjoyed watching you walk us through. Absolute confidence you will resolve with excellence.

👍 After reading your comment replies, Glad you got it sorted.

very good video max...thanks for your time

I'm thinking that the error may be due to the slope of the dovetail. The gib is parallel to the sloped face yet you are measuring the gap across the width square to the compound. When correcting the thickness of the gib you are measuring 30degrees off square to the other measurement. If your delta was 0.065 thou square, it would have to be cos(30)=0.866 corrected to 0.056.

That's quite an interesting "boo-boo" ,and I love your persistence. Thanks for the look.

Thanks max, so thorough in the measuring, I got nothing except good luck

I was scratching my head just watching the video.

Enjoyed the discussion/demonstration….along with reading the comments/discussions/ideas

Gday Max, well holy shit that’s really hard to work out what’s has gone wrong, me and maths are not real good friends but I could see and understand what you were explaining, the sine bar from Jim are very nicely made and I have one here to try out, the day after I finished the face mill arbor it arrived as luck would have it, I hope you can work out the error or a viewer can shed some light on what’s happened, great video mate, Cheers

This one's a brain teaser Max. Good to learn about the milling table (twisting) moving out of alignment ever so slightly when reversing the feed direction. That's also unlucky having a dip in your magnetic chuck, who'd of guessed it on the same job. I hope it all works out well in your next video. Tony

G'day Max. Hmm, oil flavoured rollies. The papers are handy, nicely packaged for keeping in a drawer and cheap. Now that you ruled out the sensible you look for the nonsensical. Cheers Peter

Hello Max, Well that one stretched my brain somewhat... I am generally good on logic... Great that the job is done though... Take care. Paul,,

I was initially thinking maybe the gib was a banana to begin with. But then you discovered the issue with the mag chuck. The next thing I though was that you machined down the thickness of the wrong end of the gib. That would explain the near doubling of the error.

That's a head scratcher max, I made a gib for my sebastian lathe it was a job for sure, great video, keep'um coming.

Max this is going to be a huge channel

Hi Max the fix for the compound repair has been a real head scratcher for sure. but on the bright side also a learning experience as well. cheers

That was a great vid Max, really enjoyed it.

My friend, I’ve been watching for this Episode and 4 before this session all has made since. I have made a number of dove slides. And never did ever use Unsymmetrical gib, angled on top / bottom yes but the parts that do the sliding always the same thickness. End to end Now then by correcting the slides (dove tail) by milling them true. Your overall spacing between the two rails has increased. Thus, you WILL need to increase the thickness of the gib, yes a new one. And it will become all better.😮

I like that sine bar. Thanks for sharing 👍

Compound base component across dovetails parallel within 0.0002" (0.006 or 6 micron) is Impressive on any milling machine, possibly, in hindsight, nipping the Gib on X would help, but splitting hairs here? Ref Gib strip angle, that was a head scratcher, but obvious after it being pointed out, good old compound angles 😉 or not 😱. Nice setups as expected Max, always sound practices, with a bit of ingenuity ✔. Refurbishment coming along very nicely 👌. Thanks for sharing and hope you had a few hard earned beers 🍻 Regards John

Bugger ! Like the Toyota add !! Hope you won't be looking for a piece of cast iron to make a new Gibb !

Also at a total loss here, but it's almost sorted now. Saying that it'd be nice if one of your subscribers can identify the route cause, that way we can all learn :)

The error is in the equipment....those two gages, the micrometer, and the magnetic chuck are my guess. I don't think math does any lying...very good video, thanks Max and cheers.

The problem was due to the incomplete equation you used. The angle of the dangle is equal to the means of the extremes. Using that complete equation would have eliminated all of these problems. Actually, at one point, when you were machining the gib and said that it felt to you that you should be taking more off the other end, might have been correct. I thought that the gib was backwards on the mill, and milling off that amount was going to double the error. Well, maybe that was the problem, or not. I can’t say as not being there, but when doubling an error, it may not be a measurement problem at all, but a placement one. I’ve done it myself, and was totally confused as to what happened until I retraced the exact steps I took, and realized what I had done.

I would check the mill table travel by setting a straight edge on top and checking the travel straightness. There will be a hump or dip. My mill has this problem too.

Don't know nuttin but I'd be grinding that mag table to fully flat anyway. Won't fix your problem but it will prevent the "sagging" of parts when they are magged down.

nice brainfart max ! happens to the best. glad you sorted it out. cheers ben.

I think at 7:30 you uncover the discrepancy but assumed the wrong end was too thick. I reckon it is the thin end that is too thick but a minute or two further on you say you're sure it is the thick end that's too thick. When you push it forward the gib goes in 45mm and pulled back it goes in 48mm (ie goes in further and so the gap must have been bigger - the 6 thou wear + however much you machined from the gib). So with it pushed forward and the gib gone in 45mm, the end of the gib nearest the camera must have loose play (ie the thick end is now too thin). The numbers back this up too (6-7 thou blew out to 13).

Hi Max, scratching my head, only 2 things I can think of, cosine error of DTI or dial gauge. Vertical height linearity of gauge pins at each end. Time to fit a DRO on the mill, give you exact travel measurements.

I'm guessing the 1/2 thousandth dip you think is in the sine bar is actually your XY table lowering mid-span due to wear.

Hey Max, looking clean and smart there. Those Gibs can be a bit tricky especially on chinese machines. I've found they don't follow standard tapers.

It's a little unclear if Jim Enos at Tangent Enginnerering is going to market those sine bars . If you get word that they will be coming onto the marketplace, could you give your subscribers a heads-up when that would happen?

Yeah, the answers aren't always obvious. It's really demoralizing when a measurement doesn't seem to obey the laws of physics. Not that I would know from personal experience...

Still a bit confused doesn't the pines you used to measure the angle remove the compound error ?.

Me being the bastard that i am i would have supaglued the gib into the compound slide and skimmed it parallel to the other dovetail .

Hi Max, in your last video at 11:30 you made a measurement from the opposite side of your part instead of the face that you referenced from, I'm thinking that you should have measured in between the dove tails with pins. I'm not sure but I'm thinking that is where your error is. Rich

Wrong equation. The angle of the dangle, divided by the heat of the meat and then added to the throb of the knob should sort out the error. 😉😜😂👍 Unless of course it’s a compound angle of the dangle, then you use the differential equation. The angle of the dangle is inversely proportional to the heat of the meat, provided that the maxis of the axis, and the gravity of the cavity, remain constant.

How did they machine gibs before mag chucks were invented?

Next time you do a Gib try just a simple CAD drawing of a end view. All the dimensioned needed will be the blank spot that looks like a Parallelogram. If you Drew to scale. Then all the Dimensions be the end view. Very simple. And no trigonometry😮