2:1 ELLIP. HEAD

[getb]

Can Elliptical head with 2:1 be made for OD or ID. Is it the OD or the ID of the head 2:1 ratio.
Thanks.

 

[bernoullies123]

To be safe, go with the ID... but remember that the OD and ID relative as they differ only by the thickness between the 2.

 

[getb]

Is it up to the head manufacturer to make the Outside diameter or inside diameter to be 2:1. The reason I'm asking is that when we attach a nozzle on the head to contour the bottom of the nozzle we use spherical radius by mult. the 2:1 ellip (ID/OD) by 0.9 to get sph. rad. So if the OD is 2:1 we use OD*.09 to get outside sph. rad and subtract thk. to get the inside sph. rad. If the ID is 2:1 we just simply use ID*0.9 to get inside sph. rad.

 

[JStephen]

UG-32 works with the inside dimensions, but I think our main head supplier specifies it by the OD.

 

[EngAddict]

All hot pressed heads are fixed size, manufactures have a list of standard code heads which states ID or OD for each size. Spun heads can be made to any size (OD or ID) but designing I would choose a standard size code head so they can make it however they want.

 

[r6155]

For 2:1 ellip. head the inside height "H" is ID/4 from tangent line.

Example: OD= 1000 mm and 10 mm plate, then inside H= (1000-2x10)/4 = 245 mm


regards

r6155