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| Alignment Features - Hole/Hole vs Hole/Slot |  | ||
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| Posted by: jisbell5 ® 02/02/2010, 19:04:51 Author Profile eMail author Edit |
But we have always done it that way!! I need to align two flat surfaced components, say pcb to chassis, and want to control the alignment of said components as tight as possible prior to installing fasterner hardware. The diagonal is going to give me the greatest distance and therefore, better accuracy of alignment. Dowel pins in one part and mating features in the other. I would like to know the theory behind whether utilizing two holes or, a hole and a slot, is more precise. Isn't a hole with a slot oriented along the diagonal the best possible scenario for alignment? |
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| : Alignment Features - Hole/Hole vs Hole/Slot -- jisbell5 | Post Reply | Top of thread | Engineering Forum |
| Posted by: Kelly Bramble ® 02/02/2010, 20:12:11 Author Profile eMail author Edit |
Hole to hole works fine - as long as the clearances are not so tight as to cause binding between the alignment pins and the snug fit holes. Also, if the alignment pins are longgggg.. one may have to rock the parts to get the parts to mate properly, Hole - slot is preferred for tight fits as the pin-hole positions or locates and the pin-slot stops the rotation and allows for easier installation due to the clearance along the slot length. Oh ya - Welcome to EE! |
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| : : Alignment Features - Hole/Hole vs Hole/Slot -- Kelly Bramble | Post Reply | Top of thread | Engineering Forum |
| Posted by: Kelly Bramble ® 02/03/2010, 19:19:00 Author Profile eMail author Edit |
A good rule-of-thumb is that the dowel pin should be projected about 75% of the nominal diameter to interface with the slipfit hole feature. So, a .0625 diameter dowel pin should be about .040 projected into the mating part. This works for simple alignment applications and not load carrying applications. |
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| : : Alignment Features - Hole/Hole vs Hole/Slot -- Kelly Bramble | Post Reply | Top of thread | Engineering Forum |
| Posted by: jboggs ® 02/03/2010, 07:32:31 Author Profile eMail author Edit |
You can achieve the nearly the same effect using one round and one diamond pin. Look at Carr-Lane, Reid Tool, Jergens, or any other tooling components source to see what I mean. |
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