Frequently Asked Questions
- What must I check when selecting a replacement power chuck?
- Is it possible to replace a small chuck with a larger one?
- Is it possible to replace a large chuck with a smaller model?
- What is the procedure to form soft jaws for external gripping?
- What are the standards covering the lathe spindle end?
What must I check when selecting a replacement power chuck?
You will need the power chuck’s diameter, plunger stroke, chuck bore, maximum grip force, maximum speed. With this information you will be able to replace the power chuck correctly.
Is it possible to replace a small chuck with a larger one?
This is possible; however you must check certain criteria:
- The cylinder must have sufficient drawbar pull force and stroke to suit the new chuck.
- It is also likely to need an extended drawnut, as the existing drawtube will be a smaller diameter, and shorter in length.
Is it possible to replace a large chuck with a smaller model?
This is also possible, but now the drawtube is likely to be too large. You can simply replace the drawtube, or fit a wide chuck adaptor and extended drawnut. The only operational factor that is likely to be negatively affected is the max speed which is likely to be lower.
What is the procedure to form soft jaws for external gripping?
Prepare the plug for forming. Forming outer dia. of plug is limited to finishing. Ensure the plug is strong with a suitable wall thickness.
*It is necessary to prepare different size plugs in advance.
*It is recommended to tap the centre hole of the plug and insert the bolt.
Open the master jaw fully by operating the valve.
Next, set Ø D dimension to grip around the middle of the maximum jaw stroke.
What are the standards covering the lathe spindle end?
Standards covering the lathe spindle end are stipulated in ISO, ASA, DIN etc except JIS.
Japan major lathe manufacturers manufacture the majority of lathe spindle end parts at standards of JIS-A1, A2 (ISO-A1, A2). However, a part of the lathe spindle end parts is manufactured at ASA-A1, A2.
Although the spindle end dimensions according to each standard are the same, the dimensional tolerance of a face plate (chuck or back plate) varies by a few microns.
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