Before you go after a tapered bore once precision ground by a world class manufacturer I suggest you take a moment and examine your goals and work your way step by plodding step to meet them.
First:
Is the bore clean and concentric with the spindle axis at the big end the middle and the small end? Clean the taper by non-injurious, non abrasive methods. A little transparent staining or discoloration may be ignored for the moment. Take a careful survey using an honest tenths (0." reading) indicator (or a 0. mm indicator.) Mount the indicator on a short, stiff set up. Record your data.
Second:
Has the taper been reworked by a yokel with sandpaper on a stick? This crude procedure does not remove raised metal surrounding bruises and impacted chips -- which is best remedied by localized stoning but it does uncontrollably abrade a very precise taper. You might invest $40 in a couple of slip stones one fine India and on hard Arkansas.
Once the raised metal has been stoned flush with the taper and the bore examined to determine if the original ground surface is still present you can go onto the third step: gaging.
Third:
Chances are you do not have a certified Morse taper gage nor can you borrow one. The test bar you have is likely the best (but unproven) Morse taper in your possession. Lightly blue the taper of the test bar in 4 axial stripes spaced 90 degrees. The blue should be vivid but the underlying texture of the surface should be visible through it. Insert the test bar into the spindle taper firmly set it and give it a small (15 degree) turn. Extract the test bar and examine the print in the spindle taper. There should be bearing the full length of the taper. If the blue test indicates full bearing go onto the test bar readings.. If the blue indicates out of taper the fit will be unacceptable and no meaningful readings may be taken from the bar by itself as intended but there are a few work-arounds..
If the spindle taper has been hacked or if the existing taper is pristine but the indicator reading exceed - say -0." TIR you may have a replacement spindle bearings of lower grade or they were incorrectly installed.Spindle bearings for a Monarch EE may reasonably cost up to $ a pair. The factory bearings usually last the life of the machine. If the bearings were hashed by gorillas in shop aprons and replaced in house there is no telling what grade of bearings were substituted. If this is the case you have some detective worjk and some decisions to make..
Good luck. Here's something to think about: when new a EE spindle was capable of tirning roundness specimens to 0." (one micron) circularity.
Suggested research: look up "two collar test" This accomplished the same alignment tests as the test bar but it does not prove the accuracy or the concentricity of the spindles's internal taper.
Before you go after a tapered bore once precision ground by a world class manufacturer I suggest you take a moment and examine your goals and work your way step by plodding step to meet them.
First:
Is the bore clean and concentric with the spindle axis at the big end the middle and the small end? Clean the taper by non-injurious, non abrasive methods. A little transparent staining or discoloration may be ignored for the moment. Take a careful survey using an honest tenths (0." reading) indicator (or a 0. mm indicator.) Mount the indicator on a short, stiff set up. Record your data.
Second:
Has the taper been reworked by a yokel with sandpaper on a stick? This crude procedure does not remove raised metal surrounding bruises and impacted chips -- which is best remedied by localized stoning but it does uncontrollably abrade a very precise taper. You might invest $40 in a couple of slip stones one fine India and on hard Arkansas.
Once the raised metal has been stoned flush with the taper and the bore examined to determine if the original ground surface is still present you can go onto the third step: gaging.
Third:
Chances are you do not have a certified Morse taper gage nor can you borrow one. The test bar you have is likely the best (but unproven) Morse taper in your possession. Lightly blue the taper of the test bar in 4 axial stripes spaced 90 degrees. The blue should be vivid but the underlying texture of the surface should be visible through it. Insert the test bar into the spindle taper firmly set it and give it a small (15 degree) turn. Extract the test bar and examine the print in the spindle taper. There should be bearing the full length of the taper. If the blue test indicates full bearing go onto the test bar readings.. If the blue indicates out of taper the fit will be unacceptable and no meaningful readings may be taken from the bar by itself as intended but there are a few work-arounds..
If the spindle taper has been hacked or if the existing taper is pristine but the indicator reading exceed - say -0." TIR you may have a replacement spindle bearings of lower grade or they were incorrectly installed.Spindle bearings for a Monarch EE may reasonably cost up to $ a pair. The factory bearings usually last the life of the machine. If the bearings were hashed by gorillas in shop aprons and replaced in house there is no telling what grade of bearings were substituted. If this is the case you have some detective worjk and some decisions to make..
Good luck. Here's something to think about: when new a EE spindle was capable of tirning roundness specimens to 0." (one micron) circularity.
Suggested research: look up "two collar test" This accomplished the same alignment tests as the test bar but it does not prove the accuracy or the concentricity of the spindles's internal taper.
Select Configuration Options At Bottom Of Page To Add To Cart
The chuck runout test bar can be used to test your Lathe or Turning Center for accuracy and alignments, and also to ensure a stable production environment as well as consistency moving jobs from one machine to another. The Chuck mandrel test bar can be used to confirm accuracy without the need to consistantly run test cuts on a piece of stock.
Turning Center Runout Testbars are easy to use and a fast way to verify your machine spindle is running properly and precision aligned. Check them after a machine has been crashed and take the proper steps before you start making scrap parts.
Chuck testbar runout tolerances and accuracy
Straight arbors are all 0.003 mm (3 micron) / 0.in. or better.
A2 arbors are all 0.005 mm (5 micron) / 0.in. or better.
All runout arbors include certificates.
These are surface hardened and not a soft material like many of the cheaper test bars available on the market.
Select Configuration Options At Bottom Of Page To Add To Cart
The chuck runout test bar can be used to test your Lathe or Turning Center for accuracy and alignments, and also to ensure a stable production environment as well as consistency moving jobs from one machine to another. The Chuck mandrel test bar can be used to confirm accuracy without the need to consistantly run test cuts on a piece of stock.
Turning Center Runout Testbars are easy to use and a fast way to verify your machine spindle is running properly and precision aligned. Check them after a machine has been crashed and take the proper steps before you start making scrap parts.
Contact us to discuss your requirements of Types of Cnc Tool Holders. Our experienced sales team can help you identify the options that best suit your needs.
Chuck testbar runout tolerances and accuracy
Straight arbors are all 0.003 mm (3 micron) / 0.in. or better.
A2 arbors are all 0.005 mm (5 micron) / 0.in. or better.
All runout arbors include certificates.
These are surface hardened and not a soft material like many of the cheaper test bars available on the market.
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