C'bore depth to match screw length

[edreaux]

Does anyone know of a proceedure that would create a counter bore whose depth is pre-set for the default screw lengths. For example: If I needed to use a 1/2-13 x 3" long SHCS, the counter bore would have to be a specific depth (not just the head depth that solidworks defaults to). This would keep the screw engagement from being too long or too short.

Any suggestions? Thanks.

 

[handleman]

I'm really not sure what you're trying to do. Are you wanting the counterbore to be offset from the opposite surface so that a certain length sticks out the other side to thread into the mating part? I don't think that kind of functionality is available. Hole wizard holes are set up for fastener diameter only - not length.

How tight are you trying to control your thread engagement? Why do you not just specify the appropriate length fastener?

 

[edreaux]

Yes that is exacly what I am trying to do. But I am not putting the actual fastener in the design, only the c'bore and tap holes. But I hold the c'bore depth to allow for a common screw length increment. I am currenty adding and subtracting with a calculator to get the proper depth.

 

[handleman]

You would probably have to create your hole and then edit the hole profile sketch manually. I wouldn't delete the c'bore depth dimension, but make it driven and then create another dimension from the bottom surface to the c'bore depth. I'm not sure what impact that would have later on. It could definitely cause confusion if someone else tries to edit the definition of your hole wizard hole to change the depth and it doesn't change.

 

[CorBlimeyLimey]

You may be able to do what you want using the "smart fastener" function with the counterbored hole included. Then, by correctly positioning the fastener, the hole would be created.


Helpful SW websites FAQ559-520
How to get answers to your SW questions FAQ559-1091

 

[smcadman]

Use equations. Right-click the dims of the socket head screw and it looks like this:
head length is: Head_ht@BodySke
body length dim is: Length@BodySke
The hole wizard depth looks like: Hole Depth@Sketch2

By double-clicking the parts in the assembly, just pick the dims you want to use.

I made a part called 1 (for simplicity), and this equation makes the hole depth equal to the head height and length of the cap screw. You would have to add the mating piece, but I am not recreating a whole assembly here, just showing you how to do it.

"Hole Depth@Sketch2@1.Part" = "Length@BodySke@HX-SHCS 0.5-13x3x1.5-S.Part"+"Head_ht@BodySke@HX-SHCS 0.5-13x3x1.5-S.Part"

Basically, Depth = length + head height

Flores
SW06 SP4.1