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> To calibrate bridgeport|kurt vise|sherline|taig lathe.
To calibrate bridgeport|kurt vise|sherline|taig lathe.
What is for sale: To calibrate bridgeport|kurt vise|sherline|taig lathe.
30 day satisfaction warranted or your money back
Cylindricity is the most difficult of all form tolerances. It implies perfection in all senses. A "perfect" cylinder has four main applications: DRO calibration, comparison standard, spindle aberration measurement and high precision clamping. A very versatile tool in deed.
Spindle aberration measurement
To establish the TIR (total indicator run out) of a spindle (milling machine or lathe) you need to chuck a standard to the spindle. Properly install an indicator to taste the standard. Slowly turn it (by hand or motor) to see how much the indicator moves. A perfect spindle will show a differential reading of zero.
Rong Fu | Acra | Grissly | quill calibration
Turn the spindle until you reach a minimum reading.
Move X until the indicator shows zero.
Turn the spindle until you reach a maximum.
On a milling machine, to establish how straight the spindle is to the table. Properly install an indicator to taste the standard. Slowly move the quill up and down to see how much the indicator deviates. A perfect trammed spindle will show a differential reading of zero.
Move X until the indicator shows zero.
Move the quill and read the Tram error.
To really straight clamp a stock the use of the rear vise jaw is not enough. A cylindrical standard should be placed below the stock to allow it to till along the X axis and match the rear jaw but not allowing it to till in the Y axis. Traditionally a pair of parallels are used for this application but a cylinder standard is far more precise (one order of magnitude) and it allows the stock to till so it can be precisely clamped against the rear vise jaw.
Bolster bar high precision clamping
Standard used to lift a stock and allowing a perfect
clamp against the rear vise jaw
The precision of the standard can be used to establish a reference to make other measurements. You can lie the standard on a magnetic V block and then set an indicator touching it to zero. Next you can compare other bars to see how much they deviate from the "perfect bar".
You can also chuck the standard in your lathe and touch it with a tool, then you can set you DRO (digital read out) to the standard's value. Chuck some stock and cut until you reach the preset value. You will have a bar that is close to the standards diameter. A lathe can not produce a standard, and your work will not end up as precise as the standard but at least five times its accuracy. So you can get cuts within 5
um (0.005mm | 0.0002 inches) this is a precision expected from other machines like the cylindrical grinder.
Showing an 18mm standard on a lathe being calibrated
This is a CYLINDER standard. (Cylindricity is within 0.00005 inches and diameter within 0.0002 inches.) Meaning that the only true surface is the cylinder and not the end caps. Length varies from 70mm (2.7") minimum to 100mm (3.9") maximum.
This product sales worldwide and has been manufactured in the imperial system. But that is irrelevant as you are using digital equipment that changes units with the touch of a button. And anyway what you need is the perfect shape regardless of wish unit system was used.
* We have friendly staff to help you out. Don't be shy, ask!
Warranty starts the day and time you sign for your item, recorded by the Post Office on delivery and handed to us.
30 day satisfaction warranted or your money back.
* Refunding of returned items will not be done until received and checked for a valid reason (30 day satisfaction warranty) If the returned item does not qualify for this warranty you will not be refunded. Return postage is standard rate.
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ECross@parts-recycling.com (Earlene Cross) (email hidden).