Do you want to send off the taper thimble of the lathe tailframe?

No, just loosen the locking screws.

Use a magnetometer to make a meter (micrometer measurement is also acceptable), find a bar with a length of 500mm and a diameter of 30mm, and have two nuts on both sides of the tailgate.

The tailstock of the lathe can only adjust some jobs with a relatively small taper. Or you can find the tailstock to be straightened.

Generally, the three knives are adjusted, and the workpiece size is small at the end of the bed and the head of the bed is large, indicating that the tailstock is biased towards the arms. Contrarily.

You try, it's very simple, the amount of knife is very small, three knives are enough. Adapt to your needs.

It is relatively fast to use a magnetic meter tube.

The lathe has a taper adjustment method:

1. Check the accuracy of the measuring machine tool and correct the parallelism of the spindle axis and the guide rail of the bed.

If it is found that the four corners of the machine tool and the anchor bolts and adjustment horns in the middle of the bed are loose, the horizontal straightness of the guide rail surface and the inclination in the vertical plane will seriously exceed the standard, or even be twisted, which will not only make the outer circle of the turning taper, but also affect other precision.

In this case, the anchor bolts and horns at the four corners of the machine tool and the middle part of the bed must be adjusted, the horizontal straightness of the guide rail surface of the bed and the inclination in the vertical plane must be re-corrected to meet the requirements, and the anchor screws must be tightened.

2. Before turning, align the rear center to make it coaxial with the spindle axis.

1) When it is found that there is a taper in the workpiece, the taper value is measured first, and then the moving direction of the tailstock and the moving distance of the tailstock are determined according to the size of the taper value.

Then carry out trial cutting, re-measure the size of both ends of the workpiece, detect whether the taper is eliminated, if the size requirements of the drawing are not met, then the tailstock must be adjusted again, continue to test cutting, measurement, until the size requirements of the drawing are met.

2) We usually use the "Adjust the tailstock offset method" of the tight nail top

The diameter of both ends of the workpiece is consistent in the case of the feed of the sliding plate, if the diameter of the +z direction is greater than the diameter size of the -z direction, the operator stands behind the tailstock, releases the tighter jackscrew of the left hand, and spins the tighter jackscrew of the right-hand direction, so that the center is transferred to the direction of the turning tool.

The magnetic gauge can be adsorbed on the guide rail surface or the slide plate, and the dial gauge contact is pressed on the sleeve side bus of the tailstock, and the amount of movement adjusted is the general diameter difference, if the diameter of the +z direction is less than the diameter of the -2 direction, the adjustment method is reversed.

3. Replace the tailstock sleeve with a new one.

If the tailstock sleeve is used for a long time, it will be seriously worn.

There are many reasons for the taper of the lathe, the spindle and the track are not parallel and perpendicular, the track wears, the tailstock eccentricity, etc., the lathe should be 100mm taper allowable error 1 wire, the operator can only calibrate the tailstock, the other is a matter of machine repair, the solution can be said above, that is, the thimble must exit the top pressure state when the tailstock is corrected, otherwise it is not allowed.

Under what circumstances does the taper arise, for example, is it a clamp and a cart outer circle that produces a taper, or?

There are mainly the following reasons for the taper: the front of the car is offset. Workaround:

Blessing a bar about 100mm thick, the length of the car is 100mm to see the light, measure its taper with a micrometer, and adjust it appropriately. Under normal circumstances, the allowable error is within two: the tailstock is deviated.

Solution: Bless a bar, "because the tailstock is often debugged, generally choose the size of the workpiece that is often processed as the size of the bar to be blessed, the length is the same" The outer circle sees the light, and the micrometer measures the outer diameter According to the error, the magnetic gauge base is pressed against the centerline of the outer circle of the tailstock sleeve, and the tailstock is offset, and the offset is half of the error, that is, 50%, and it is repeatedly adjusted twice until the requirements are met. Three:

The last case, that is, the track of the lathe is worn too severely, and when the large supporting plate moves, it does not move in a straight line to produce a taper of the workpiece. Solution: Grind the lathe track until it meets the requirements.

That's basically it, I hope it can help you.

The workpiece should have a certain length, too short is not good. The chuck can't be clamped, and the axial force on the center is too great.

If the workpiece is 300 mm long, there is no problem in machining a taper of 2 degrees. The workpiece is shorter and the degree should be reduced accordingly, the chuck should have a mouth, be able to hold the workpiece, even if the workpiece is loose, it will not move the piece, the speed is low, pay attention to safety.

First of all, it is necessary to adjust the taper of the machine tool to see if the spindle has a taper with the tail seat; if it is very heavy, use a live thimble, because he is a bearing, and will not be subjected to a lot of force; If it is light, it is recommended to use a dead thimble, and the machining accuracy of the dead thimble is higher than that of the live thimble.

If it is not very heavy, you can use a steady rest and put it at the tail, if it is very workpiece, you have to put 2 of them, one at each end.

The way to find the right is to find the circle before and after, and after finding the circle, theoretically speaking, it will be concentric.

What is the outer diameter and what is the ratio of length?

Test run at both ends, micrometer measurement, tailstock hit a dial gauge (remember to loosen the nut of fastening the tailstock), the tailstock is small, loosen the screws on the outside, and tighten the front (the taper is more than half of the number, such as the taper 30 wires, you just look at the watch tightened over 15 wires)!