Symbol: A circle with a horizontal line bisecting it
Symbol: A circle with a horizontal line bisecting it
(OP)
It appears on a customer drawing and I don't know what it means.
thanks for helping,
Bogiedreamer
thanks for helping,
Bogiedreamer





RE: Symbol: A circle with a horizontal line bisecting it
I can think of a diameter symbol, but the line should be at an angle.
Or a seam weld, but it should have double horiz lines.
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP2.0 / PDMWorks 05
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RE: Symbol: A circle with a horizontal line bisecting it
the upper half usually shows dia.X , which denote a datum stopper (a pin in this case) of X in diameter.
And the lower half denote the datum axis, eg. Y2, datum point 2 of Y-axis.
Best regards,
ct
RE: Symbol: A circle with a horizontal line bisecting it
Chris,
The diameter symbol has the bisecting line at 45* but this line is horizontal.
Ct,
That is what I am thinking. But the top and bottom halves are left blank.
RE: Symbol: A circle with a horizontal line bisecting it
RE: Symbol: A circle with a horizontal line bisecting it
RE: Symbol: A circle with a horizontal line bisecting it
If your bisected circle has an arrow or line pointing at something, it is either a datum target, or an assembly item number.
A datum target will have a letter and number in the lower half, such as A1, A2, A3, B1, B2... The top half of the circle might contain a diameter specification. You will have to read a GD&T reference like ASME Y14.5M-1994. I would not want to have to explain this in text. We do have a GD&T forum.
On assembly drawings, some people want to include the part quantity as well as the item number. The top number is an item number corresponding to a line on a BOM. The bottom number is the quantity of parts required. This is supported by CAD software like SolidWorks. I do not know what drafting standard calls this up.
If it does not conform to either of the above descriptions, then it is something else, and hopefully, someone else can help you.
JHG
RE: Symbol: A circle with a horizontal line bisecting it
Judging from other responses, equally valid, your interpretation probably depends on the context of the print.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Symbol: A circle with a horizontal line bisecting it