- Thread starter julianf
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Kram
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As its thin sheet in mild it might be worth using a fluteless tap, gives stronger threads. I imagine they are less easy to break. I got couple but not tried yet. The drilling size is bigger as the tap is not cutting material away.
www.zoro.co.uk
Kennedy M2.5 X 0.45 Fluteless Tap DIN 371-BRIGHT K| at Zoro
Kennedy - M2.5 X 0.45 Fluteless Tap DIN 371-BRIGHT available at Zoro.co.uk - UK's Leading Supplier of DIY Tools and Supplies'
julianf
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If i spend £200 on a tool, you can be sure ill find something additional to do with it! : )
daedalusminos
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Clinch nut worth considering?
the pressing company that I used to work for would have tapped thousands of theads a day in sheet metal, although they used taping machines they would just use spiral point taps as indicated above. I'd be using a small cordless drill/driver for doing them freehand. some of the 10.8-12v ones are geared slowly too.
Agroshield
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See, for example, machine-tapping.co.uk (part of Allandale's DRO empire).
Trouble is, none of the arm-mounted machines I could find go below M3 and are over his budget.
However, see: https://www.cotswold-machinery-sales.co.uk/used-machines/
Good idea. Not only is the thread stronger, but the tap is stronger as well. They are quite fussy on hole size as you say, more so than a fluted tap.
julianf
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Ok, so i think m2.5 is 0.45 pitch.
From what i read, for a fluteless tap, you subtract the pitch from the major diameter for the drill size. So id want a 2.05mm hole, right?
I did a little bit of a google for presto and dormer m2.5 fluteless, but didn't really come up with anything obvious.
Any other brands that i should look for? There are, of course, a load of pocket change ones on ebay but I'm not even looking at them!
Thank you.
From what i read, for a fluteless tap, you subtract the pitch from the major diameter for the drill size. So id want a 2.05mm hole, right?
I did a little bit of a google for presto and dormer m2.5 fluteless, but didn't really come up with anything obvious.
Any other brands that i should look for? There are, of course, a load of pocket change ones on ebay but I'm not even looking at them!
Thank you.
Kram
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No fluteless is 2.3mm. 2.05 is for standard cut threads.
I read that an extreme presssure cutting lubricant should be used with fluteless. Does my pot of mixed engine oil, wd40, water and petrol count?
To be honest any of these will do it, even the cheapest £4 is HSSE sp/pt.
I could use a 2.5mm for tapping lathe tool blanks for insert screws, which may be high tensile steel so Im going for this. They work ok on mild but no idea what it'll be like after 50 or 1000 holes.
I read that an extreme presssure cutting lubricant should be used with fluteless. Does my pot of mixed engine oil, wd40, water and petrol count?
To be honest any of these will do it, even the cheapest £4 is HSSE sp/pt.
M2.5 (Spiral,Fluteless) Tap for sale | eBay
Find great deals on eBay for M2.5 (Spiral,Fluteless) Tap. Shop with confidence.
www.ebay.co.uk
I could use a 2.5mm for tapping lathe tool blanks for insert screws, which may be high tensile steel so Im going for this. They work ok on mild but no idea what it'll be like after 50 or 1000 holes.
M2.5 x 0.45 SPIRAL FLUTE TAP COBALT RED RING DIN371 6H TM15300250 EUROPA TOOL | eBay
Find many great new & used options and get the best deals for M2.5 x 0.45 SPIRAL FLUTE TAP COBALT RED RING DIN371 6H TM15300250 EUROPA TOOL at the best online prices at eBay! Free delivery for many products!
www.ebay.co.uk
julianf
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Ok, so ive approved the laser cutting at 2.3mm dia for the pilots, and just ordered one of these -
which i think is some Japanese company's product.
Ill have a go on the first 5 units (170 holes) with what i have here (drill press, battery drill, etc) and see how i go.
If the job is a go-er, then ill order one of those things for the drill press.
One concern - my drill press has a little run-out. Ive never measured it, but i dont clamp parts when drilling, as there is a little wobble. Obviously more apparent with long drills.
I assume, if people are talking about doing these with hand drills, that getting one of those reversing chucks wont be a problem with some minor run out? Again, its not like ill be clamping the part anyway, as ill be working at speed.
Thanks to all.
M2.5 x 0.45 FLUTELESS THREAD FORMING ROLL TAP OSG RH4-P | eBay
Find many great new & used options and get the best deals for M2.5 x 0.45 FLUTELESS THREAD FORMING ROLL TAP OSG RH4-P at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk
which i think is some Japanese company's product.
Ill have a go on the first 5 units (170 holes) with what i have here (drill press, battery drill, etc) and see how i go.
If the job is a go-er, then ill order one of those things for the drill press.
One concern - my drill press has a little run-out. Ive never measured it, but i dont clamp parts when drilling, as there is a little wobble. Obviously more apparent with long drills.
I assume, if people are talking about doing these with hand drills, that getting one of those reversing chucks wont be a problem with some minor run out? Again, its not like ill be clamping the part anyway, as ill be working at speed.
Thanks to all.
Johnnybravo
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No it’s not. OSG is a premium Japanese cutting tool manufacturer who has been around the 1940’s
Ask @MattH if anyone knows it wil be him.
Drill taps would do that either in a drill press or out.The part is very similar to one of these -
The holes I need to tap are around that internal rim.
It's folded in 1.5steel and the rim is actually a bit narrower than the one in the photo.
Do you think the deflection / vibration will be an issue? I'd assume not, but if I knew, I wouldn't be asking! : )
I have a load of 20mm thick steel bar to put a 20mm tapped hole in soon I hope. I will be using a tapping head if it all goes ahead.
But if I was doing that personally I would use an electric drill with a good quality drill/tap. As I have a mill and pillar drill I would make a jig up if I had a lot.
Rkweld
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I would make up a block with a tap clearance hole in it to clamp over the hole to guide the tap in dead straight. I would do it by hand because on that thickness it will be a doddle and you wont snap the taps with the right size T bar. but if you prefer use a drill with clutch slip set really low.
