| Author | Message | ||
     Cyclonemduece |
I am doing thunderstorms on a sporty and need to enlarge the mounting holes, from 3/8 to 7/16 is it best to drill and tap new or drill and install heli coil? | ||
| Lovedabueller |
yes. and the stronger option. | ||
| Cyclonemduece |
love i dont understand your answer | ||
| Big_koch |
Helicoils are stronger than drill & tap. | ||
| Cyclonemduece |
really? i had no idea. I did indeed learn some new stuff today. thanks koch | ||
| Jramsey |
Buell head bracket size 7/16x14 XL head bracket size 3/8x16 No threads in either bracket. Drill Sporty frame head mount bracket hole 29/64 and use 7/16 bolt. Heli-Coil type inserts have their use but not very often and they are no stronger than the material they are inserted into. | ||
| Cyclonemduece |
Ok so let me try to understand i dont need to do anything to the head, it is the bracket that needs to be enlarged? | ||
| Jramsey |
Yep. | ||
| Big_koch |
Not relevant to the thread any longer, but helicoils are, in fact, stronger than simply tapping the parent material. Larger surface area of aluminum gripping the helicoil means the aluminum sees less load for a given area. Therefore....a helicoil in a given thread size will stress the parent material less than threads of the same size directly into the parent material. | ||
| Jramsey |
Then why not just tap the hole the next size larger and be done with it. Threaded inserts(coil/spring type)are for the most part a quick fix for thread repairing at only 60-65 % thread depth, if they were better all OEM manufacturer's would put them in to start with instead of plain tapping at 75-80% thread depth. A good part of my time every week is spent between the milling machine and the welding table repairing "previously repaired threaded holes". (Message edited by jramsey on April 10, 2009) | ||
| Oldog |
A good part of my time every week is spent between the milling machine and the welding table repairing "previously repaired threaded holes". AS was mine too, We did not Helicoil many parts so if you base the load on loaded area then "helicoils are stronger" is true, Based on My real world experience and observation not so. | ||
| Sportyeric |
The Sporty head has a hole on one side and a stud on the other. The Buell head, of course, has holes on both sides. Put in the bolts to loosely mount the bracket before you put the head on the cylinder. Otherwise the bolt doesn't clear the frame and you'll have to take the head off again. (That's why they used the stud.) |
