Brett said:
Ha ha good to see that I put a cat amongst the pigeons excellent.
Understand Piet what you were saying I was just being exact and looked up the chart that the local tool supplier gave me for understanding drill sizing for taps...
as funny thing on my FCR venture the throttle slide screws are 3.5mm ( who uses such a dumb size ) anywho was thinking 3mm would see me right but no went off to the local tool suppler and told him I needed to tap some 3.5mm threads so what size bit do you reckomend. I also told him that wanted to do some for 7mm. He comes back with a 2.9mm and a 6.1mm bits and a tap to drill size chart for me. ( they know I am a bit of a luddite when it comes to metric they even sold me some digital calipers to make life easier for me )
By the by grease a front end who does that anymore ??? that went out with the arc me thinks you are flat out finding a grease gun these days in most of the dealers I visit. Not even the trucks ( Dodge Rams ) that we distribute have grease nipples in the front end anymore.
Hey Brett, you should let Brembo know that they are drilling their holes too small.
While you?re at it, perhaps you should also let these manufacturers of the finest high quality taps know that they also have it wrong.
https://www.dormerpramet.com/Downloads/2015_NAFTA_Dormer_Catalog-English.pdf p270
http://www.goliath.com.au/Goliath%20Threading%20Chart%20A2.pdf
http://www.suttontools.com/products/straight-flute-tap-sets-mc-t901/
At 6.1mm you have lost 10% of effective thread, add to that the fact that most external threads are undersize by 0.1mm to 0.2mm, you have now lost up to 30% effective thread on a 1mm pitch, if you consider that your caliper is made from soft anodised Aluminium that strips easily, then add to that 10,000psi hydraulics and brakes, a bleed screw that?s a millimetre undersize and you have a leak, a projectile and a time bomb ,how safe do you feel, multiple injuries or death and another Laverda gone.
Brembo use a 5.8mm tapping drill for M7 bleed screws to increase effective thread depth which is why you can screw an M6 bleed screw in but can?t stop it from weeping.
Try and put a 6.00mm drill into the hole, it won?t go unless it?s been in the hands of a mechanic.
Put your old M7 bleed screws back in, put the rubber caps back on and ride it while you have the health to do so.
And remember for metric threads, to achieve 75% effective thread;
Od ? P = td, eg, M3.5-0.6=2.9
Jacko.
Brett, do you know what a sump plug is, or do you have to google it when you change the air cleaner.
6.10mm drills also cost much more than 6.00mm.
: