Please ask the speed of ordinary lathes and how to adjust the speed of ordinary lathes

1. The bigger the drill bit, the slower the rotation speed, the drill bit will be burned if the drilling speed is fast, 10 will come to about 300 to 400, 20 will come to 200 to 300, 30 will come to 150 to 200, 40 and 50 will come to 100 or so.

2, between 10-50 can come to about 600 to 700, but also depends on what material you car, if it is a very hard material, you can only come to 400 to 500, because it will make the knife wear out quickly, especially the tip of the knife, wear and tear on the car will not move, or there will be a phenomenon of making the knife.

The drilling speed adjustment mainly depends on what kind of parts are processed, if the drill bit with a diameter of 10 is medium carbon steel, you can choose 400-500 rpm, the drill bit of 20-30 can choose 200-350, the drill bit of 30-40 selects 100-220 rpm, and the drill bit above 40 is generally about 100. The larger the diameter of the drill bit. The lower the rotational speed, if it is stainless steel, the rotational speed is lower, and the same is true for high-carbon steel and tool steel.

The speed of the outer circle turning of the workpiece is generally the larger the outer diameter, the slower the speed, such as medium carbon steel, the outer circle of 10 mm, the speed can be selected 500-600 when turning, to 20-40, the general choice is 400-550, the diameter of 40-100 can choose 150-400, the larger the diameter, the slower the speed, rough turning can reduce the speed, improve the amount of walking and eating tools, fine turning, the above speed can be increased. If it's high-carbon steel and tool steel. Then the speed should be lower, and the material should be relatively hard.

The bigger the drill bit, the slower the rotation speed, and the drill bit will be burned out if the drill speed is fast, 10 will come to about 300 to 400, 20 will come to 200 or so, 30 will come to 150 to 200, 40 and 50 will come to 100 or so.

Cutting speed vc = 90-140 m min, speed n = (1000*vc) (, d refers to the diameter of the workpiece, I am talking about the parameters of the Israeli vargus insert.

When cutting, you should concentrate on the cutting situation, observe the cutting situation diagonally behind the tool holder, and do not turn your head in the direction of rotation of the work.

Always pay attention to the cutting flow direction, and do not leave the machine tool at will.

To change the speed of the spindle, it is necessary to stop the operation.

When cutting, you should not rotate the workpiece too closely.

Cutting amount Cutting amount is three elements.

The cutting amount refers to the general term of the cutting speed v c, the feed f (or feed speed v f), and the back eating tool amount a p, also known as the three elements of cutting amount. It is the process parameter required to adjust the relative speed of movement and the relative position between the tool and the workpiece. They are defined as follows:

a) Cutting speed v c

The instantaneous velocity of the selected point on the cutting edge with respect to the main motion of the workpiece. The calculation formula is as follows: v c = ( d w n ) 1000 (1-1) where v c - cutting speed (m s) ;

dw - the diameter of the surface of the workpiece to be machined (mm);

n - the speed of the workpiece (r s).

The maximum cutting speed should be used in the calculation, for example, in the case of turning, the value of the diameter of the surface to be machined, because here the speed is the highest and the tool wears the fastest.

b) Feed f

The relative displacement of the tool and the workpiece in the direction of feed motion for each rotation of the workpiece or tool.

The feed rate v f refers to the instantaneous velocity of the selected point on the cutting edge with respect to the feed movement of the workpiece.

v f=fn （ 1-2 ）

where v f – feed speed (mm s);

n - spindle speed (r s);

f - feed (mm).

3) The amount of knife on the back is a p

The amount of wear measured by the base point of the cutting edge and perpendicular to the direction of the work plane. According to this definition, if in the longitudinal outer circle of the car, the amount of the back knife can be calculated according to the following formula:

a p = ( d w — d m ) 2 ( 1-3 ) where d w - the diameter of the surface of the workpiece to be machined (mm);

dm – the diameter of the machined surface of the workpiece (mm).

Probably experience.

Let's not talk about the cutting speed, but the actual experience of tool wear is still slower. It also depends on what kind of cutter you use, and the amount of pass has to do with it.

Adjustments can be made using the gear lever.

The speed of the lathe is usually used for cutting work, and the cutting carbon steel can be about 40m min (40 except the diameter), and the feed is the pass speed (feed rate).

Carbon steel rough turning is generally far away, the back cutting volume is about 3mm (eating depth), and the cutting speed of fine turning is about 80m min feed. When adjusting, the cutting speed is a variable value, and its maximum value can be appropriately increased compared with the outer circle of the car.