Tolerance on a conical cylinder
Tolerance on a conical cylinder
(OP)
Hi. Are the tolerances different when making a conical cylinder in comparison to making a right (Straight) cylinder on a CNC lathe?
thank you.
thank you.
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Tolerance on a conical cylinder
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RE: Tolerance on a conical cylinder
Tolerances are dictated by function.
You, as the designer, are the only one who knows what tolerance is required for your part. It's your job to specify the necessary tolerances on the drawing.
It becomes manufacturing's responsibility to produce parts within those tolerances.
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
If you want to know if "something" is possible you need to define what "something" is first.
Comparing an unknown conical something to an unknown cylindrical something isn't a useful exercise.
RE: Tolerance on a conical cylinder
There are some good examples of how to tolerance a cone in the ASME Y14.5 standards. Both the 1994 and the 2009 versions have them. To answer your question as I understand it: No, they are not toleranced the same. Cylinders require a single size tolerance on the diameter and maybe a form control. Cones need at least two dimensions but they be a combination of two diameters and a distance between them, or one diameter, an angle, and a length.
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2010
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Tolerance on a conical cylinder
Generally, no.
In fact sometimes you have to program a cone to produce cylinder.
The difference will show up if the angle of the cone is so big, it looks more like a flat face than a cylinder. Also variations in RPMs and feed will affect the accuracy, not to mention using different materials.
And don’t forget: measuring cone is different from measuring cylinder, so even if they are same accuracy it may be difficult to prove.
RE: Tolerance on a conical cylinder
The dimensions is about 8mm to 18mm in diameter over 250mm. I need about 0,01mm tolerances, this is most important at the end with the largest diameter. The material isnt defined yet, but it'll be some kind of hight strength stainless steel. Is this doable?
RE: Tolerance on a conical cylinder
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2010
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
Why are you saying it's not possible on a lathe? You then say it might be possible on a Swiss. Are you saying that this is just an impossible tolerance to hold unless you find the right Swiss machine to do it on?
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2010
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Tolerance on a conical cylinder
No way that stays straight on a conventional lathe during machining.
RE: Tolerance on a conical cylinder
So what is the smallest tolerance you think a conventional lathe could hold?
Powerhound, GDTP S-0731
Engineering Technician
Inventor 2010
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
What if i up the dimensions to 25mm - 20mm at the same length?
RE: Tolerance on a conical cylinder
RE: Tolerance on a conical cylinder
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Tolerance on a conical cylinder
On 18 mm diameter stock?
RE: Tolerance on a conical cylinder
Nope, won't be precision turning at that size range. Centerless grinding for those sizes.
Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com
RE: Tolerance on a conical cylinder