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June 17, 2021

Installation and Adjustment of Laser Pipe Cutting Chuck Accuracy(1)

The installation instructions are compiled for the purpose of adjusting and keeping the center(rotation axis) of two chucks with the required range, so that the equipment can meet the processing requirements of users. We hope that each equipment manufactutr can operate strictly according to this installation procedure. We also appreciate customers' communicating with us about the installation details, so that we can make improvement in time. 

1.Fix two products on the worktable according to the design requirements. As shown in the figure, the left chuck is named 'feeding chuck' and the right chuck is named 'main chuck'.

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2.Screw down the fixing screws of the feeding chuck and remove the dust cover on the feeding chuck. As shown in the figure, measure the upper bus bar at the head rotating part of feeding chuck. The magnetic base is fixed on the machine(not on the mounting table of feeding chuck), with the pointer pointing to the position shown in the figure. Move the entire mounting table to the left and right, measure and ensure that the upper bus bar value is below 0.05mm. Upper bus bar valie exceeding the reuired scope can be adjusted by inserting copper sheet at two points on the bottom mounting surface of chuck.

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3.Measure the side bus bar at the head rotating part of feeding chuck. The magnetic base is fixed on the machine(not on the mounting table of feeding chuck), with the pointer pointing to the position shown in the figure. Move the entire mounting table to the left and right, measure and ensure that the side bus bar value is below 0.05mm. If the side bus bar value is out of the scope, it can be adjusted to the required scope by slightly rotating the mounting base of main chuck. After adjustment, check again if the bus bar accuracy meets standard in steps shown in para.2. If the value is still out of the scope, repeat the adjustment till the error value of upper bus bar and side bus bar of feeding chuck is below 0.05mm.

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4.With the center of feeding chuck as the benchmark(the rotation center of feeding chuck), measure the verticality of the reference plane on the back of the main chuck relative to the rotation center of feeding chuck.
   Measurement and adjustment method: the magnetic base is fixed on the end face of the feeding chuck, with the pointer of dial indicator pointing to the position shown in the figure(reference plane of the main chuck). Slowily turn the feeding chuck for one circle and observe the pointer reading of the dial indicator. The difference of the four points within the maximum transverse and vertical range measured shall be within 0.05mm. Error between two lateral points exceeding the required scope, if any, may be adjusted by inserting copper sheet at two points on the bottom mounting surface of chuck. Repeat the step several times till the error value is witin 0.05mm.

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5.With the center of feeding chuck as the benchmark(the rotation cneter of feeding chuck), measure the coaxiality between the rotation center of main chuck and the rotation center of feeding chuck, that is, the center of two chucks shall be of equal height.
   Measurement and adjustment method: the magnetic base is fixed on the end face of the feeding chuck, with the pointer of dial indicator pointing to the position shown in the figure(inner wall of basic hole in main chuck). Slowily turn the feeding chuck for one circle and observe the pointer reading of the dial indicator. The difference of the four points within the maximum transverse and vertical range measured shall be within 0.05mm. Error between two lateral points exceeding the required scope, if any, may be adjusted by slightly and transversely moving the mounting base of the main chuck. Error between two vertical(up and down) points exceeding the required scope, if any, can be adjusted by inserting copper sheet at four points on the bottom mounting surface of chuck. Repeat the step several times till the error value is witin 0.05mm. After adjustment, check again if the accuracy meets standard in steps shown in para.4. If the value is still out of the scope, repeat the adjustment till the error value is below 0.05mm.

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6. Measurement and adjustment of chuck centering accuracy.
   Adjust  the distance between two chucks between 500mm and 1000mm, and clamp the same mandrel. The mandrel shall be 1500-2000mm long and have a diameter of 30-50mm. The magnetic base is fixed on the machine, with the pointer pointing to the position shown in the figure(at the outer circle of mandrel about 30mm away from the claw). Rotate the chuck and mandrel. The dia indicator respectively measures the mandrel runout at the position about 30mm away from the claw and the mandrel runout of about 0.1mm is acceptable(in genral, the clamping accuracy of claw had been adjusted before delivery of chuck. Users need to adjust the claw accuracy in case of customized product or other special circumstances). If the value is out of the specified scope, adjust the position of corresponding claw to meet the accuracy requirements.

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7.Check the overall accuracy.
   Adjust the distance between two chucks between 500mm and 1000mm, and clamp the same mandrel. The magnetic base is fixed on the machine, with the pointer pointing to the position shown in the figure(at the outer circle of mandrel about 30mm away from the mian chuck claw). Move the feeding chuck back and forth, so that the distance between feeding chuck and main chuck is 100mm-1000mm or so( the feeding chuck can be moved to the center hole of the main chuck). The value difference of the dial indicator pointer of about 0.05mm is acceptable. In the same way, point the dial indicator pointer to the outer circle of the mandrel side, and the overall installation is qualified if the indicator value of dial indicator is about 0.05mm. If the value difference is still out of the scope, carefully check the details of the above steps and confirm if there is any omission or if an accuracy item is out of the scope.

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8.Please read above steps carefully before installing and debugging the equipment. This installation insruction is compiled based on the installation and debugging experience of most equipment manufactures. Please follow the instructions carefully.
 

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