BSP tap needed

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BSP tap needed

This topic has 15 replies, 10 voices, and was last updated 16 April 2021 at 10:30 by David George 1.

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14 April 2021 at 15:06 #539701
pgrbff
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@pgrbff
I need to make a single threaded hole, 1/4"bsp into the side of a 1 1/4" BSP iron pipe.

As this may be the first and last time I will probably need to tap a 1/4" bsp hole will a single taper tap do?

Edited By pgrbff on 14/04/2021 15:06:52
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14 April 2021 at 15:06 #10800
pgrbff
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@pgrbff
14 April 2021 at 15:10 #539703
Martin Kyte
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@martinkyte99762
I should think so, if not just grind the end off a little.

regards Martin
14 April 2021 at 15:13 #539704
Alan Wilkinson 1
Participant
@alanwilkinson1
Yes if you can get through far enough to get the full thread
14 April 2021 at 15:42 #539711
HOWARDT
Participant
@howardt
If you an get one buy a second tap, a little less taper lead than a taper tap.
14 April 2021 at 15:52 #539713
Dr. MC Black
Participant
@dr-mcblack73214
Have you considered going as far as you can with a taper tap and then grinding away the taper sufficiently to use what's left to create the full thread?
14 April 2021 at 17:18 #539728
pgrbff
Participant
@pgrbff
As a woodworker I don't often need taps. I want to make up a mixing valve for my sandblaster and need to tap a 1/4" BSP hole in the side of a 1 1/4" iron tube. I'd prefer to buy only one tap and I'm not sure which would be the best choice. Are BSP threads always tapered?
14 April 2021 at 17:41 #539735
Steviegtr
Participant
@steviegtr
Posted by pgrbff on 14/04/2021 17:18:26:

As a woodworker I don't often need taps. I want to make up a mixing valve for my sandblaster and need to tap a 1/4" BSP hole in the side of a 1 1/4" iron tube. I'd prefer to buy only one tap and I'm not sure which would be the best choice. Are BSP threads always tapered?

No, there are tapered & none tapered. This has been covered before somewhere on here.

Steve.
14 April 2021 at 18:21 #539740
Robert Butler
Participant
@robertbutler92161
Where are you based, I have a selection of BSP taps.

Robert Butler
14 April 2021 at 18:41 #539746
not done it yet
Participant
@notdoneityet
You could make a flat on the pipe, weld on a suitable fitting and drill through?
14 April 2021 at 20:06 #539761
David George 1
Participant
@davidgeorge1
Hi Steve. Have you thought of using a T joint. 1 1/4 x 1 1/4 x 1/4 My local pipe suplier will thread the 1 1/4 pipe for very little whilst I wait and not a lot of money. You will get a better seal as a pipe is not that thick pipe section and not many threads.

David
14 April 2021 at 23:28 #539793
Hopper
Participant
@hopper
Posted by pgrbff on 14/04/2021 17:18:26:

As a woodworker I don't often need taps. I want to make up a mixing valve for my sandblaster and need to tap a 1/4" BSP hole in the side of a 1 1/4" iron tube. I'd prefer to buy only one tap and I'm not sure which would be the best choice. Are BSP threads always tapered?

You need to look at the fitting you want to screw into the tapped hole. If the male thread on the fitting is tapered, you will need BSPT tap. (T for tapered.) Most ordinary black or galv pipe fittings will be the tapered thread, put together with thread tape or sealant.
15 April 2021 at 06:50 #539808
not done it yet
Participant
@notdoneityet
Posted by Hopper on 14/04/2021 23:28:37

You need to look at the fitting you want to screw into the tapped hole. If the male thread on the fitting is tapered, you will need BSPT tap. (T for tapered.) Most ordinary black or galv pipe fittings will be the tapered thread, put together with thread tape or sealant.

If it is not an arduous duty, make a flat as use a parallel thread plus a sealing washer?
16 April 2021 at 07:43 #539967
pgrbff
Participant
@pgrbff
Posted by Robert Butler on 14/04/2021 18:21:32:

Where are you based, I have a selection of BSP taps.

Robert Butler

Thanks but I'm in Italy. At least I can find BSP taps here, German seem to be reasonably priced. Normally I buy used English manufactured from Ebay when I other than metric.
16 April 2021 at 07:46 #539969
pgrbff
Participant
@pgrbff
Posted by David George 1 on 14/04/2021 20:06:58:

Hi Steve. Have you thought of using a T joint. 1 1/4 x 1 1/4 x 1/4 My local pipe suplier will thread the 1 1/4 pipe for very little whilst I wait and not a lot of money. You will get a better seal as a pipe is not that thick pipe section and not many threads.

David

I'm trying to keep the airflow in the 1 1/4 pipe as smoth as possible. I need to tap a small valve into the pipe to allow air in, and be able to adjust how much air, to hopefully create a venturi effect to open up glass beads flowing through the pipe.
16 April 2021 at 10:30 #539998
David George 1
Participant
@davidgeorge1
Hi is this for some type of sand/glass bead blasting machine. If it is, I have made one in the past and I would have thought that adding air into an already pressurised pipe would have been counteractive to the flow and venturi effect further back down the pipe, perhaps slowing down suction on venturi. The biggest problem I had was moisture in the media/air and clogging after a while of not using it clearing set beads.

David
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