Rocket tranny no room for grommet

[Greg]

What are some possible solutions you guys have come up with? The rubber grommets I have are not flush and the rocket trannies are. I thought a few larger washers under the trannies would give enough clearance.

Thoughts...

[M Fowler]

Usually you drill the hole under the bells, either on both sides of the tranny or one side, depending on the brand of tranny you are using. There is plenty of room for the grommet. However, since your having trouble you can raise the tranny using washers or some other type of spacer you can find. You can also wrap the wire in tape or shrink tube to protect it from being cut by the hole edge. Not sure if trimming one side of the grommet off inserted from inside chassis glueing it would work.

I had to raise my tranny on one builds (Liverpool) because I had placed some inside components before the tranny was installed and then found out the bolt head was smack under the tranny mounting plate so I raised it and was off and running.

Mark

[sliberty]

What Mark said.

I suppose if all else fails, you could put 2 layers of shrink wrap on the wires to protect them from the hole, but I would only do that as the very last resort, and only if I had smothed that hole REALLY WELL.

A photo would be helpful.

[Allynmey]

Greg, the rockets (real ones) used no grommet. Just oversize the hole. and deburr accordingly. If you drill correctly you will see there is no metal to wire connections.

[Ron Worley]

Usually you drill the hole under the bells, either on both sides of the tranny or one side, depending on the brand of tranny you are using. There is plenty of room for the grommet. However, since your having trouble you can raise the tranny using washers or some other type of spacer you can find. You can also wrap the wire in tape or shrink tube to protect it from being cut by the hole edge. Not sure if trimming one side of the grommet off inserted from inside chassis glueing it would work.

I had to raise my tranny on one builds (Liverpool) because I had placed some inside components before the tranny was installed and then found out the bolt head was smack under the tranny mounting plate so I raised it and was off and running.

Mark

One thing I have done when the tranny was on top of one of the PS board standoff machine screws was to (very carefully) use a taper bit to drill a beveled hole and use a tapered flat head machine screw.... works like champ.... but be careful not to over drill it!

[benoit]

What Mark said.

I suppose if all else fails, you could put 2 layers of shrink wrap on the wires to protect them from the hole, but I would only do that as the very last resort, and only if I had smothed that hole REALLY WELL.

A photo would be helpful.

If you were really worried about it you could tape some foam around the leads to keep them away from the edges or some such thing, or cut off the top of the grommet and glue it in place from the bottom.

[gahult]

Greg,
I made mention of that to you in a previous message.
I used silicone around the wires of the trannys before mounting them. After they were mounted and wired I used more to protect them from the chassis.
The silicone is the same stuff used on the cap stack.
Here again is the actual size chassis template I made.

Gary

[Greg]

Holes are drilled to Gary's specs...wires go through very nicely. I think grommets are less of an issue with perfectly alligned holes.

Thank you Gary. Are you healing well?

Every time I step into the mancave to work on the Donna Rocket I discover I need a new tool. Time to buy a deburring tool.

[gahult]

Greg,

Yes, healing up OK. Doc will xray collar bone in 3 weeks. If it's not healing well or "I don't like how it looks" he will put a plate in. Says his football players are hitting again in 6 weeks but, at 3 weeks I still have bone passing bone when I move. Said ribs could take 6 months to heal. Great

Any way If you have an old 3 corner file you can belt sand the faces to a sharp edge and it will do for a nice deburring tool. We recyle them that way at the shop all the time. They work fine.

Gary

[Structo]

Yeah, I have to say that broken ribs are one of the most painful things to go through. They take a long time to heal and older you get the longer it seems to take.

They used to tape up the rib cage but I don't think they do that anymore unless the bone has to be reset.

[Greg]

so they basically become a chisel?

[Greg]

My sister in law is prego and the baby kicked and pushed so hard it broke one of her ribs. The doctor said that that and pelvic fractures are not to uncommon...

[gahult]

Greg,
For size a 3/8" or so works nice. They taper down on the tip so you can get into small holes too.

Just sand the teeth off of the faces on the file. The 3 corners will be sharp.
Then you have 3 edges to debur with before it needs to be sharpened by sanding the faces again. You only need an inch or so on the end.

The files are hard and we use them on steel so I can imagine they will last quite a while used on aluminum. Don't get it too hot while sanding it so it stays hard.

I have one at home I used on my chassis and other stuff around the garage.

Gary

[mlp-mx6]

I prefer to use those plastic snap-in bushings on tranny wire holes.

[M Fowler]

For deburring the holes just use a larger drill bit at slow speed with very slight pressure so it only takes the material away by polishing the material. Or buy some more tools.

Ben you miss quoted me darn it.

Mark