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PostPosted: Wed Apr 01, 2015 10:04 am 
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Hi,

I'm doing a Half-pipe / skate ramp. I have to drill holes in a stainless tube but I wasn't able to with HSS Drill tips last night (I've followed youtube video tutorials, such as https://www.youtube.com/watch?v=NtqXlOX_kF4). The stainless tube is this one: http://www.ebay.co.uk/itm/Stainless-Steel-T304-Tube-Multiple-Sizes-and-Lengths-For-Exhaust-Tube-Repair-/131262360181?ssPageName=ADME:X:RTQ:GB:1123

Today I'm thinking about picking new drill tips ( http://www.screwfix.com/p/erbauer-hss-drill-bit-set-13-pieces/25087 ), but not sure if this will work ?

Can someone experienced give me some advice ? I'm using a driller ( http://www.screwfix.com/p/energer-enb463drl-710w-percussion-drill-230-240v/99423 ) and I also have a screw driver ( http://www.screwfix.com/p/titan-ttd272ddh-14-4v-1-5ah-ni-cd-cordless-drill-driver/36869 ).

The steps: Lubricate, do it slowly, etc.


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PostPosted: Wed Apr 01, 2015 10:40 am 
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T304 is a tough S.S. and you would be better to use cobalt drills (Amazon do some reasonable ones); problem with stainless is that it does not conduct heat away from the drill tip, so even water coolant is better than none but be careful with the electric's for the drill. Start with 2 second bursts of drilling, no hammer action, then lifting the drill bit off the surface for 5 seconds to let the coolant pool in the hole and tip to cool; difficult to get smooth holes as chatter is likely and a rat tail file might be handy, be aware of swarf / chips which easily penetrate the skin.
Example for a 8>10mm dia hole 200>400RPM less is best.
Good luck.


Last edited by aeromech3 on Wed Apr 01, 2015 10:53 am, edited 1 time in total.

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PostPosted: Wed Apr 01, 2015 10:45 am 
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Thanks for replying!

I was going to order from Amazon, but will take time to get the items here and I wanted to use this free Friday. I tried to find cobalt drills on screwfix but apparently they don't sell it there ? www.screwfix.com, I also tried B&Q, and they don't sell it either apparently.

Yesterday I got some cheap HSS from the local DIY store, it didn't work. One hour work and not a full hole.

Absolutely sure these won't work ? http://www.screwfix.com/p/erbauer-hss-drill-bit-set-13-pieces/25087
I was planning getting it today, but of course I don't know much so why I'm here asking : )


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PostPosted: Wed Apr 01, 2015 11:00 am 
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If S.Fix is local to you they do a cobalt pilot drill but you would need to see what diameter it is, item 52111. what diameter are you making your holes?


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PostPosted: Wed Apr 01, 2015 11:09 am 
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Thanks for your attention once again!

I'm working on a Halfpipe skate ramp and the steel tube is for the coping part.

There's two ways to put the tube on the halfpipe, two holes, that is one bigger and one small. You can see it here, search for coping (http://diyskate.com/quarter_02.html), or to have a single hole and use spring toggles screw, so depends on the size of the head of this ( http://www.screwfix.com/p/rawlplug-spring-toggles-m5-x-80mm-pack-of-20/98223 ). I think I want to go with a single hole for this job, I don't mind drilling two holes side by side to have it fit there, I guess ?

Is this what you're talking about ? I'll get it today!
http://www.screwfix.com/p/bosch-powerchange-hss-cobalt-pilot-drill/52111

by the way can I sue this with my driller ? http://www.screwfix.com/p/energer-enb463drl-710w-percussion-drill-230-240v/99423 and I also have a screw driver ( http://www.screwfix.com/p/titan-ttd272ddh-14-4v-1-5ah-ni-cd-cordless-drill-driver/36869


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PostPosted: Wed Apr 01, 2015 11:26 am 
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Yes but sorry this bit is unlikely to be as big as 3/8".
Your drill has standard 3 jaw chuck so should grip the shaft good, an SDS would not.


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PostPosted: Wed Apr 01, 2015 2:52 pm 
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Thanks once again!

I found a store not to far from here, so I can go there just after work. I found this Cobal Drill bits, http://www.toolstation.com/shop/p68884
Let me know your opinion if possible : )


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PostPosted: Wed Apr 01, 2015 3:27 pm 
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Have used Heller, good find, but 8mm is only about 5/16", too small for a decent screw head!
You would need 77012 for a 10mm hole and the the 2mm & 3mm in the kit are likely to bend / snap easy in your drill unless you are ultra careful
you might be better to choose the bits singularly.


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PostPosted: Wed Apr 01, 2015 5:35 pm 
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I use domer drill bits on stanless steel with good results

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PostPosted: Wed Apr 01, 2015 10:33 pm 
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I drill all grades of stainless with standard (but good quality) HSS bits without issue.

As mentioned above, keep the speed low, but you will need to push quite hard.
With your drill, you would want it set on one of the slowest settings.


I trust you have centre punched to start the drill off, save it from wandering?
In the absence of a centre punch, a couple layers of masking take will stop the drill from skating.


Id be looking at starting with a 4mm pilot, then open it out to 10mm.

I have always found cobalt bits are a bit brittle, and cant cope with misuse/sideways pressure.

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PostPosted: Thu Sep 17, 2015 8:49 pm 
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If your drilling 10mm holes with a hand held drilling machine in SS then the web is to thick especially if the drill has been sharpened and is short . So pilot dril first with a small diameter drill , short stub drillsare good for this as they have a thinned web as well. 3 or 4mm HSS or cobalt should be ok in 304 or 316 SS

High pressure and slightly lower speed , with coolant/lubricant , oil or Whatever you have even the old WD40. Avoid the drill rubbing keep it cutting.

Eye protection SS often comes of in chips and is nasty in the eye , watch out here comes a blinder !


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