Slimline transmission threads...

[joek30296]

Anyone know what size threads are on a 7mm slimline transmission (the internal threads that the refill screws into). I can get a 10-32 bolt to screw in about 3 or 4 threads, but that's it. Gotta feeling they're going to be metric.
I have an idea that, if it works, I'll pass on later, with pics. But I need to know the thread size.

Thanks in advance for your help and Merry Christmas.:embarrassed:

Joe

 

[okiebugg]

Taiwan

I think that you pretty well answered your own question when you said it came from Taiwan. Metrics dominate everything in the Asian thinking just like the brits

 

[KBs Pensnmore]

Anyone know what size threads are on a 7mm slimline transmission (the internal threads that the refill screws into). I can get a 10-32 bolt to screw in about 3 or 4 threads, but that's it. Gotta feeling they're going to be metric.
I have an idea that, if it works, I'll pass on later, with pics. But I need to know the thread size.

Thanks in advance for your help and Merry Christmas.:embarrassed:

Joe

Hi Joe,
It is a metric pitch, 4.5X.75 is what I measured it at.
In my Engineers Black Book it is listed as a Metric Course, requiring a tapping drill of 3.70MM (.1457") .005" over 9/64 (.1406")and a clearance drill size of 4.60MM (.1811") .0064" under 3/16 (.1875").
There is a good chance that you might be able to get the tap/die and drill, from a reputable Engineers Supply Store, or one that specialises in selling bolts, nuts and fasteners. I doubt it would come from your local hardware store. If you can't get one let me know and I'll see what I can get for you.
A Merry Christmas and a Happy New Year to everyone Up Top, from Down Under
Regards
Kryn

 

[mredburn]

http://www.victornet.com/subdepartments/Metric-Taps/1310.html

$3.60 at victor machinery. unfortunatly they do have a $25.00 minimum.

 

[snyiper]

McMaster-Carr no minimum:: 6.00 and some change.
Catalog Page|BookmarkBookmarked


Metric High-Speed Steel Hand Tap Taper, 4.5 X .75mm, D4 Pitch Dia, 4 Flute



Each

In stock

 

[joek30296]

Guys,
Thanks so much for your info. I was trying to remove the transmission from a slimline pen without damaging it. Here's what I came up with and it seemed to work fairly well with the 10-32 screw but I'm sure would work better with the correct threads. I've only done this twice, so I'm not positive it'll work every time.

As you can see in the photo, the sleeve is about 1.25 long with a 9/32 hole drilled through. It's slipped over the screw and wingnut, then screwed into the transmission. By holding onto the pen body and tightening the wingnut, the transmission will slide up into the sleeve and out of the pen body.

I guess this will work on other pens but I've only tried it on slimlines. Hope this helps someone else down the road.

Merry Christmas and Happy New Year to all of you.

Joe

 

[mredburn]

There are other ways without using a tap or bolt in the threads of the tranny. I will get you the links.

http://www.penmakersguild.com/articles/mistakes.pdf

By Rich Kleinhenz on the penmakers guild forum. Includes pictures. Its meant to be able to adjust the tranny but you can use it to remove it as well.

 

[navycop]

I tried this and it works. I drilled a hole in a piece of corian.
http://content.penturners.org/library/tools_and_jigs/A_SIMPLE_7MM_DISASSEMBLY_TOOL.pdf

 

[KBs Pensnmore]

Joe
Thanks for the tip, I'm nearly always pushing the trans in to far when assembling to start. Do you mind if I copy the idea.
Merry Christmas and a Happy New Year,
Kryn

 

[joek30296]

Kryn,
It would be my pleasure for you to use my tip. "Imitation is the sincerest form of flattery".

Merry Christmas and Happy New Year.

Joe

 

[GColeman]

When I tried to pull a transmission this way it pulled the threads out of the barrel. I may not have had the bolt threaded in far enough.

 

[Bellsy]

I think that you pretty well answered your own question when you said it came from Taiwan. Metrics dominate everything in the Asian thinking just like the brits

Have you ever wondered why the standard threads on the bottom of cameras that hold them to the camera tripods are imperial. 1/4" - 20

 

[sbell111]

I think that you pretty well answered your own question when you said it came from Taiwan. Metrics dominate everything in the Asian thinking just like the brits

Have you ever wondered why the standard threads on the bottom of cameras that hold them to the camera tripods are imperial. 1/4" - 20

Because the US used to dominate the camera market.

Regarding the breads topic, slimline transmissions are dirt cheap. I prefer to simply knock them out and replace them.

 

[KBs Pensnmore]

Regarding the breads topic, slimline transmissions are dirt cheap. I prefer to simply knock them out and replace them.[/quote]



That they might be, but you still gotta get them out

 

[TerryBlanchard]

Joe you did not work at Bonnell did you. I used to buy lots of extrusion from them. Coleman Lassetter was my internal sales person.

 

[joek30296]

GColeman,
That happened on the third one I tried also. Maybe I need to go back to the drawing board on this one. It worked the first time I did it, but....."one trick don't make a circus".
So sorry if I misled anyone on this tip. Thought I was being helpful.

TerryBlanchard,
No, I didn't work at Bonnell but I've passed by it several times here in Newnan.

Joe