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Question on mill/drill traming.

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SonofHarold - Metal Carver

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It got down into the 30s 2-3 weeks ago, that's not normal for sunny SoCal! Well it happens every 4-5 yrs. It snowed here last week where it never snows. I didn't actually see it though.

Reminded me of this video about it. :D

I was stationed up at Edwards AFB near Palmdale in the 70's and it snowed once, about 3-4 inches. Seems it hit all at once and I was in a truck out near the end of one of the runways near the dry lake. Visibility went to what seemed like near zero with no refferences out there anyway drove down the taxiway feeling when the right side wheels would drop off the pavment going like 15 mph to find our way back to the parking ramp and our hanger. Fun times! They closed the base and we all got to go home for the day.
 

yendor

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One more thing to consider is you are using a drill chhuck to hold your indcator.
the drill chuck will have it own runout that will add error to your process.

I used a grizzly indictor holder that clamps onto the quill and doesn't introduce additional error.

Its on sale right now for $11.99 (-$4.00)
It worked great for me.
 

SonofHarold - Metal Carver

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I did buy one of the holders lke those, (as I'd saw one before being used on a bridgeport) without measureing, and it is too small and will not fit my quill by about 1/4" I have ordered the correct size collett tho to hold the indicator. If I am calculating the error from the angle correctly (which makes my driret reading from the indicator smaller(?) I think I have it all within about a thou tho at this point. That said I may just wait for that collet before I go and do anything more... Thnx
 

Technical Ted

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One more thing to consider is you are using a drill chhuck to hold your indcator.
the drill chuck will have it own runout that will add error to your process.
Sorry, but I have to disagree unless I'm misunderstanding what you mean. Clamping up on an indicator mount in a chuck or something else that runs out will not effect the accuracy of the reading. You can also use an edge finder in a 3 jaw chuck that runs out and it will be accurate.

You could use a mag base and attach it to the side of the chuck and it would work just fine also.

I do love those holders though. I have an Indicol and use it all the time!

Ted
 

SonofHarold - Metal Carver

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I was kind of second guessing about the chuck throughing out at least the measurement I was trying to get and being a new to this thought I was might be missing something. I know a drill chuck is not a supper accurate way to hold things... .but I want to have a 1/4" collette anyway
(hi my name is John and I'm tool addicit)
But I am now declaring a success and Much Thanks and Kudos being due! It was a good learning experience regarding the details of using a Test indicator plus I got my mill/drill trammed to a closer tollerance than I thought would be possible, along with a fair amount ot practice getting the vise on and off and trammed as well, which is pretty easy now. Got the indicator to a postion with an angle that was about 20 - 25 degs and a little larger sweep circle as well. Applying the correction factor for a 30 degree angle ( from the Federal instruction sheet I found) and it is within a thou all the way around. Close to only half a thou in the tilt and just shy of a full thou in the nod front being the "high" point. I also tried it again with the brake rotor and it was about the same, turned the rotor 90 and still the same. I then undid everything, set it all up again from scratch and still +- .001 or less.
Thanks everyone but especially Mikey,TT and Norseman! Yinz all try and stay warm... :D
 

darkzero

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Sorry, but I have to disagree unless I'm misunderstanding what you mean. Clamping up on an indicator mount in a chuck or something else that runs out will not effect the accuracy of the reading. You can also use an edge finder in a 3 jaw chuck that runs out and it will be accurate.

You could use a mag base and attach it to the side of the chuck and it would work just fine also.

I do love those holders though. I have an Indicol and use it all the time!

Ted
Yep. Indicator is logical, doesn't matter what it's mou ted to or held in cause it's spinning on the spindle axis. When I first heard about using in edge finder in a drill chuck with runout I didn't understand it or believed it until I tried it. It was just as accurate in a drill chuck that had .003 runout as it was in a collet.

But what is affected are the electronic contact type edge finders. Those matter cause you don't use them spinning. I use one when I don't want to mar a finish.

Still I always use edge finders in a collet though. I also love holders and enjoy using my Nogas.
 

RJSakowski

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Is you mill drill a HF model? All the Rong Fu mills have two bolts only, although I think three would be better.
That's an interesting question. The mill was private labeled by a local DIY. I can't find the nameplate butI am quite sure it was a Taiwan machine. Thr user manual calls it a JP-30 but inside, it is referred to as an RF-30. There is an anomaly though. The table is speced as 8-1/4 x 28-3/4 but actually measures 9-1/2 x 23-1/3. It has a 2 hp motor and the column diameter is just over 4". I purchased it around 1980.
 

mikey

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Doesn't really matter, RJ. I just noticed that the HF-sourced mills have three bolts and the RF models have two. Personally, I would rather have three bolts.
 

yendor

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Hmmm... apparently I stand corrected and that's not a bad thing.
It always good to learn something. I was thinking someting with it's own built in error would pass that same error onto an indicator but it seems not.

I'm going to have to go try this myself but only for satisfaction purposes.
I suspect you guys have much more knowledge than me.
I've got a LOT to learn still... (just ask my wife :)
 

SonofHarold - Metal Carver

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I did buy one of the holders lke those, (as I'd saw one before being used on a bridgeport) without measureing, and it is too small and will not fit my quill by about 1/4" I have ordered the correct size collett tho to hold the indicator. If I am calculating the error from the angle correctly (which makes my driret reading from the indicator smaller(?) I think I have it all within about a thou tho at this point. That said I may just wait for that collet before I go and do anything more... Thnx
OK. Got the collet to hold the indicator rather than the 3 jaw. rechecked it all around, and after doing just a couple of practice type, making swarf cuts it looks to still be in the +-0.001, Even after raising the head a bit on the column. I am happy that its going to stay but I'll be rechecking in several months just to up my confidence, Again - thanks for every ones help!
 
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