Floating vise build

[DPittman]

My 7/16-10 Acme tap arrived today.
Nothing left to do but the doing!

I bet that will take some grunt to turn

 

[DavidR8]

I bet that will take some grunt to turn

Yup...my plan is to drill to size for 1/2-10 Acme but pre-tap with the 7/16-10 first to take out the bulk of the material. Then follow up with my 1/2-10 Acme tandem tap.

 

[DPittman]

Yup...my plan is to drill to size for 1/2-10 Acme but pre-tap with the 7/16-10 first to take out the bulk of the material. Then follow up with my 1/2-10 Acme tandem tap.

That's thinking! I would not have thought of that.

 

[PeterT]

Something in the back of my mind seems to remember hearing that pre-tapping is not recommended even though the same pitch & thread form. But I can't think of why. Maybe because the smaller tap is not being guided within its normal matching smaller bore, so there is a possibility to drift off axis inside the larger 0.500 bore & cut into one side more than the other & thus influence the bigger tap coming in after? I could be off base, like I say, foggy recollection.

 

[Alexander]

Internal acme threads are so hard to cut at home. I bought an inserted threading bar for a simple lathe cross slide nut. If the tap works then great. I usually see these acme taps used in rebuilding shops to chase threads.

 

[DavidR8]

Something in the back of my mind seems to remember hearing that pre-tapping is not recommended even though the same pitch & thread form. But I can't think of why. Maybe because the smaller tap is not being guided within its normal matching smaller bore, so there is a possibility to drift off axis inside the larger 0.500 bore & cut into one side more than the other & thus influence the bigger tap coming in after? I could be off base, like I say, foggy recollection.

Yes I thought this might be an issue.
I'll drill and run the 7/16-10 on my mill so that I maintain location of the hole.

 

[DavidR8]

Internal acme threads are so hard to cut at home. I bought an inserted threading bar for a simple lathe cross slide nut. If the tap works then great. I usually see these acme taps used in rebuilding shops to chase threads.

Indeed. It took an oversize hole to even start the tap on two tests that I did, Even then the force required is astounding.

 

[YYCHM]

Where is this project at?

 

[DavidR8]

It’s sitting on my bench waiting for me the finish putting the forks from my Honda NT650 back together.

 

[Tom O]

Why the 2 difference Springs?

 

[DavidR8]

Why the 2 difference Springs?

They are the same, I had just pullled them out of the fork legs, one was just installed upside down. It's a former racebike so it had a bunch of suspension work done to it. Not all of it correctly.

 

[YYCHM]

They are the same, I had just pullled them out of the fork legs, one was just installed upside down. It's a former racebike so it had a bunch of suspension work done to it. Not all of it correctly.

So that should have been a matched pair?

 

[DavidR8]

So that should have been a matched pair?

They are matched pair, one was just installed upside down. They have progressively wound coils, the other end of the one on the right looks exactly like the one on the left.

 

[Tom O]

Ok I had to ask.

 

[DavidR8]

I was equally perplexed when I pulled them out.

 

[YYCHM]

Where is this project at?

 

[DavidR8]

Sitting quietly on my bench.

 

[DavidR8]

I've been swamped with work and house projects.