Tap and Die. What size handle do I need for a 1¼" BSP tap. (1 Viewer)

[scotjimland]

Just use an adjustable spanner,i,ve been a pipefitter for over 50yrs and on the rare occasion where a tap is reqd that's all i've used, just make sure you keep it square to the hole and use plenty of oil

likewise..

 

[Gromett]

ok. I have a plan.

I am going to buy a 1" to 1/2" adapter.

And a small drill press thingy. not really a drill press but.

The plan would be to clamp this to the sheet. Lower the head so the tap is in contact with the hole. Then use a ratchet on the top to slowly drive it in. Obviously reversing to clear swarf as per normal tapping.
This will allow me to keep it straight/parallel/90° to the material while applying a reasonable amount of pressure and turning.

I was thinking about a drill press but for some of the holes that are more central to a sheet I wouldn't be able to get it under the drill enough.

I will probably screw this to a sheet of MDF to allow me to clamp at the edges.

Just an initial thought/plan. Might not work but worth a go.

 

[Gromett]

Possibly won't even need to clamp it down.

 

[Gromett]

Well that plan failed at the first hurdle. The tap didn't fit into the adapter and the stand I ended up ordering had a round drive rather than the hex one in the image. So they got returned today.
I decided to do some measuring of my existing handles and extrapolate to what size I would need.
While then searching for M32-M42 handles (I still wasn't sure) I found these on Ebay.

BAR TYPE TAP WRENCH Small-Large ADJUSTABLE Vehicle Threading Tool Holder Handle | eBay

Top quality tools for hand tapping operations. Long Handles give greater leverage. Hardened and tempered jaw. Notice: Oil on tool to prevent it from rusting before receiving the product.

www.ebay.co.uk

So. 1½" tap handle ordered. Should easily handle my 1¼" tap

Another £54 into this project.

 

[Silver-Fox]

Parallel threads are normally used with a sealing washer (Copper, bonded or Dowty)

Boy have I fitted a lot of “Dowty” washers when working at Dowty Mining Equipment

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[Silver-Fox]

The big boy arrived today and jeez it is bigger than it looks in the picture.


View attachment 890277

Bloody hell that’s a hell of a size or you’ve got kids size hands

No offence

 

[Silver-Fox]

Well that plan failed at the first hurdle. The tap didn't fit into the adapter and the stand I ended up ordering had a round drive rather than the hex one in the image. So they got returned today.
I decided to do some measuring of my existing handles and extrapolate to what size I would need.
While then searching for M32-M42 handles (I still wasn't sure) I found these on Ebay.

BAR TYPE TAP WRENCH Small-Large ADJUSTABLE Vehicle Threading Tool Holder Handle | eBay

Top quality tools for hand tapping operations. Long Handles give greater leverage. Hardened and tempered jaw. Notice: Oil on tool to prevent it from rusting before receiving the product.

www.ebay.co.uk

So. 1½" tap handle ordered. Should easily handle my 1¼" tap

Another £54 into this project.

Have you not got a spanner that fits the tap.

You could have made a tap spanner from a piece of ply

 

[Burgo]

Lost mine years ago......I found mole grips a good fit.

For small taps you can get by using a micrometer screwed up tight - on a second tap then if you've got a strong thumb you can use a vernier gauge to clamp it.

 

[Gromett]

Bloody hell that’s a hell of a size or you’ve got kids size hands

No offence

Well they (my small hands) make my willy look big

 

[Gromett]

Have you not got a spanner that fits the tap.

You could have made a tap spanner from a piece of ply

A spanner would not do the job. I need to be able to hold it square and level.

I am not half arsing this. I want to be able to do an excellent job and probably doing LOTS of these each year. Worth the investment.

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[Burgo]

A spanner would not do the job. I need to be able to hold it square and level.

I am not half arsing this. I want to be able to do an excellent job and probably doing LOTS of these each year. Worth the investment.

Machine up an adaptor for it to fit your pillar drill and run it in by hand or using a chain strap around the chuck? That'd also help you keep it vertically true as with a big handle the bars are longer so more leverage to get out of true.

 

[jockaneezer]

Get yourself a short piece of round bar machined up with a 42mm hole in it and use that to guide the tap squarely into the job.

 

[BillyKontiki]

A pair of mole grips/ vice grips will do the job.

 

[Gromett]

Machine up an adaptor for it to fit your pillar drill and run it in by hand or using a chain strap around the chuck? That'd also help you keep it vertically true as with a big handle the bars are longer so more leverage to get out of true.

Can't use a pillar drill as the sheets of plastic may be too big to fit under one. Needs a universal solution.

 

[Gromett]

Get yourself a short piece of round bar machined up with a 42mm hole in it and use that to guide the tap squarely into the job.

Got some small corner blocks already on order.

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[Gromett]

A pair of mole grips/ vice grips will do the job.

Did you see the size of the tap. Mole grips would not do the job sorry.

 

[Gromett]

I have the handle ordered and I have designed a jig which might possibly work. Will be an interesting engineering project
Can't wait for next week when the plastic sheets arrive.