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#1
10-22-2006, 08:33 PM
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can I use this gauge to measure cylinders?
I saw this set of gauges -
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=5649 Looks like you set the gauge then use a measuring tool on the gauge. Question is, assuming I'm measuring an irregular cylinder, how do I get the gauge out while retaining the setting? Seems I have to disrupt the setting and count turns (lose precision) or risk scratching the cylinder. What am I missing? Thanks, Sixto 93 300SD 
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#2
10-22-2006, 09:10 PM
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To use these gauges select one that has the range of your bore dia. Loosen the handle, push in the two ends together (only one actually moves), insert it into the bore, make sure that the handle is vertical to the centerline of the bore, loosen the handle which will allow the end to spring out to the bore's dia., tighten the handle, cock the tool sideways slightly, and slide it out of the bore. Measure the gauge length with a micrometer and that will give you the dia.
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#3
10-22-2006, 10:17 PM
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Kip's right about the procedure, however, if you are looking for an out of round condition or a tapered conditon, you'll be there forever in a vailant attempt to get some hard data. Each measurement requires you to remove the tool and measure it carefully with a micrometer.
Far better would be an inside bore gauge that has the dial already attached to the unit. You set it in the bore.......seek out perpindicularity.......and read the dial. Then you move it up or down the bore..........or twist it 90 degrees.........and measure again. You can get 20 measurements on the bore within 10 minutes. With the Harbor Freight tool, 20 measurements will take you all day. Sure, the Harbor Freight tool is a fraction of the price, but, what's your time worth?
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#5
10-23-2006, 09:41 PM
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Quote:
I recently had the pleasure of using a professional gauge that is setup to read an I.D. It's set properly on size blocks and each line on the dial is .0001". I could accurately determine the out of round condition on a brand new piece of tooling that I had made. It was .000050". This was the accuracy of the grinding spindle and/or the slight change caused by the installation. Such a gauge is about $1200. but, you get what you pay for.
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#6
10-24-2006, 01:45 AM
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$1200 will buy me new 603.97 rods and pistons
 The trouble with $1200 tools is you have to know how to use them. I know a guy with machine shop connections who offered his services to measure out the block. He's also a 603 guy so I have his attention. Sixto 93 300SD
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#7
10-24-2006, 09:04 AM
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Quote:
Anyone can measure to .000050" with the $1200. tool. I defy you to measure to .0005" with the $30. Harbor Freight specials.
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#8
10-24-2006, 06:23 PM
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Sixto, I think you have a missconception about that Harbour Freight tool... I get this impression from your statement about ' counting the turns' .... implying you are familiar with old micrometers...
They measure by utilizing the movement on finely made threads... The tool which you referenced at HF is a spring loaded extension tool... so you line up the place ( typically six measurements total..three along one plane and three at 90 degrees to that)... The shop manual specifies where.... typically at the top of the ring travel for one of them... What you do is put that tool at the proper place let the spring loose... then tighten it and turn it sideways enough to get it out of the bore... THEN you still need something to Measure with...and " Touch" becomes very important to getting reliable measurements ... even more so since you are not measureing the actual bore... but only this ' capture' of that distance... As has been mentioned... to do this right you will be dealing with much smaller increments than usual....and even if you had the proper size screw micrometer with which to measure what you pull out of this cylinder I think much of the accuracy will be lost in " touch".... This is one of those situations where if you are at a place where you can stick you hand into the bore It might be better to just put a new sleeve into it...
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#9
10-25-2006, 02:01 PM
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I understand the tool is a template to take to a measuring tool and there is inherent 'noise' in the process. My specific concern was with turning the tool to get it out. Seems that can scratch an otherwise fine bore.
This was a hypothetical question. I'll leave the measuring to someone else. I was never good in lab. Sixto 93 300SD
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#10
10-25-2006, 02:24 PM
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Those are polished and hardened tips which are in contact with the bore.. so no problem in scratching...anyway... I would have to assume that before putting the pistons back in some type of crosshatching would be performed...
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