Reply With QuoteCould you get a jeweller to do it ?
0.5mm drill bits are tiny...
So, the reason for the request; I have a KTM 790 Adventure R. I have read about several cases where the clutches have gone pop and KTM aren't interested in the reason why - owners are left to fend for themselves.
One suggestion to explain the weak clutch is the small oil jet in the clutch basket with an opening of just 0.3 mm. Several owners have drilled out the oil jet to 0.5 mm. I believe this gives a nice boost to the oil fed into the clutch basket without compromising the oil pressure.
Just after suggestions for a company, or individual, that could drill the oil jet out for me. Anyone have any recommendations?
Could you get a jeweller to do it ?
0.5mm drill bits are tiny...
I have some tiny drill bits the size you mention and even smaller but there is always the possibility they could snap if not going in straight or they bite, why dont you just try these for £3.76?
https://www.ebay.co.uk/itm/10x-Micro...jKTo1hQmBRPYxQ
Last edited by murkeywaters; 18th May 2020 at 16:12.
https://uk.rs-online.com/web/c/pcb-p...cb-drill-bits/
if you order it now you will have it in the morning.
Originally Posted by murkeywaters
Question: Wouldn't a borer or reamer be more appropriate tools for the job?
Maybe try a jewellers broacher or reamer?
Bear in mind a bit will drill Very slightly larger then it’s size quite often.A 0.4mm would be what I would use first then double check the hole size.Pin chucks have their uses here for such small size drill bits.As others say maybe a broach?
Last edited by lew07; 18th May 2020 at 16:42.
A reamer would be best for a smooth clean hole, eh up! But you may also need a corresponding drill bit to take out the hole to the minimum size needed to ream..
A reamer would only be required if the hole requirement was for an exact size, for example needing an interference fit fastener or bush, or for a sliding rod. This is merely an oil feed hole being opened up from 0.3mm to 0.5mm, its tiny and doesn't need to be exact. As long as all swarf is cleared a 0.4 or 0.5mm drill will be fine, but much skill is required, and not a little luck.
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Last edited by Ruggertech; 18th May 2020 at 17:13.
A .5mm drill bit is just a nightmare waiting to happen. I regularly use 1.5mm and even they have suicidal tendencies built in.
Started out with nothing. Still have most of it left.
Quite. A bit snapping would be a nightmare.
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How big is the bit with the hole in, can it be removed and sent somewhere?
Thank you both
We drill down to .2 using a Pcb drill on a stand, never tried it freehand
^ This - I know an engineers who could probably help if you can send the bit to them.
If there isn’t a clearance issue , could a larger hole be drilled & tapped & fit a screw in jet / fitting with the desired hole diameter.
I had no idea what OP was talking about, turns out its a bike!
The easiest way to do this is to use a cutting broach and open the hole out, I’m assuming its aluminium so it’ll cut easily. A smoothing broach will smooth the finish but also provides a way of measuring the size of the new hole using a digital caliper to measure where the broach is a snug fit ( broaches are tapered). This is far simpler than it sounds, I frequently broach replacement watch hands to fit this way.
Are you sure there will be no detriment to oil flow elsewhere? Flow rate increase equates to the ratio of the area of the old and new orifice, if more oils going through the new hole it means less will go elsewhere.
This.
A Dremel mounted in a drill stand will do it.
A broach used carefully in a pin vice will do the job. Its important work carefully to avoid snapping it, not easy if you’re not used to working with small stuff.
I assume the OP has though about swarf and where it’ll end up?
Thanks for the replies gents. The oil jet can be removed, but I have ordered a new one to get opened out. This job is a bit too intricate for me to attempt using my trusty Bosch drill!
I was hoping there was a resident here who has used these tiny dril bits before and might volunteer for a fee.
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That makes the whole job easier!
Maybe pop the jet in a lathe and drill it out?
Simple job if you have access to a lathe
As Paul has alluded to above, oil flow follows a “square rule” in relation to bore or pipe diameter so the increase from 0.3-0.5 will probably make quite a difference
Ps someone on eBay sells them with a 0.5 hole for £5.99 ��
Last edited by GOAT; 19th May 2020 at 07:41.
Cheers for the heads up G, I will see if I can find it.
Edit: just found it, doesn't fit my bike which is a shame.
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Last edited by electorn; 19th May 2020 at 13:45.
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