Hand press

[toxo]

1 hour ago, mcguyver42 said:

Creeping Clarity, well said.  Tapping a helicoil to a different thread, I never thought about that.  Can they came back out if they need to and then go back in again?

Nor me. Someone more knowledgeable will answer that. I haven't messed with helicoils for fifty years.

[fredk]

Note. Off topic. Just to answer queries

We did the first 1/4" bolt into M6 helicoils  fitting by accident. We had two parts bolted together, one had threaded through holes and the other had threaded blind holes. The design of the parts is that the bolt is screwed part way through first part, the part offered up to the second part and the bolts run up tight. There are short locating sleeves to help with alignment so the first few mm of the hole in second part has no thread

1. we had through holes with near stripped 1/4 inch threads

2. I drilled out and ran M6 helicoils into the through holes. Intention was to put M6 helicoils into the blind holes as well. But I held off as changing to M6 was going to compromise the part.

3. No.1 son accidently took the 1/4 inch bolts and bolted the two parts together thinking I'd finished and all was ready for re-assembly.

4. when we realised what we'd done we took some bolts out and checked and they needed unscrewing their whole length

5. We used this same process on purpose on a few other 1/4 inch bolt threads.

I think the threads on the 1/4 inch were British Whitworth, just slightly off from M6. The helicoil, by its nature of being a coiled spring can expand slightly to accommodate the difference.

[mcguyver42]

Ok, Whitworth, I've heard of that but not familiar.  Was that a valve body?

[fredk]

2 hours ago, mcguyver42 said:

Was that a valve body?

no, it was a top gears cover to lower cover / engine nose / engine and also a dynamo mounting to the top gears cover

[mcguyver42]

Well, glad that worked out for you, and I'll keep the helicoil tip in mind.  Dynamo, I love it!

[ButtonLady]

I am following this thread with great interest, although we're getting into territory I normally leave to my machinist.

mcguyver42, I really like your calipers!  Mine are cheap imported digital crap.  My husband tried to teach me how to use his manual set... and gave up in frustration (in my defense, math was involved).

 

[seabee]

HI,  I forgot about is post. At 76, I do that a lot.  I setup my arbor press like the following.  Used a steel plate 3/8 x 6 x 6 to make a table on the press. I also pined the plate using the small hole in the press.  Than used a 6x6 cutting board, used a scroll saw to cut the hole for the die base. I than used roll pins in the four corner of the to hold it in place on the plate, no movement.  For the ram, I took the die handle and cut it to 2" long.  Drilled a hole in the end of the ram, installed a set screw.  I like this setup.  I hope this will help.

Howard

[ButtonLady]

To the man who started it all...  thanks, seabee!

 

9 hours ago, seabee said:

For the ram, I took the die handle and cut it to 2" long.  Drilled a hole in the end of the ram, installed a set screw.

On a semi-related note, the manufacturer of the machine I sell calls this piece a "pin" (see marked photo below):

Some customers call it a piston.  Would it more properly be called a ram?  (apologies for the hijack)

[fredk]

13 hours ago, ButtonLady said:

I am following this thread with great interest, although we're getting into territory I normally leave to my machinist.

mcguyver42, I really like your calipers!  Mine are cheap imported digital crap.  My husband tried to teach me how to use his manual set... and gave up in frustration (in my defense, math was involved).

Don't diss yourself over that. I use a cheapo digital caliper as well. Its good enough to tell me which ball park I'm playing in. My expensive superior ones are in a tool box, unloved

I've always called that part the ram

[ButtonLady]

The El-Cheapo calipers are... okay, but they eat batteries like crazy (which are not cheap).

 

5 hours ago, fredk said:

I've always called that part the ram

Thanks!  Just updated the website description.