What do you mean by mic? Calipers?trek97 said:Can anyone recommend a decent quality mic that will read down to .001mm. That wont break the bank.
My crappy digital only reads to .01mm - .0005inch.
deviant said:What do you mean by mic? Calipers?
I have some Mitutoyo I can send ya. I get them from my mom when light shines through the tip. They're dial though, not digital.trek97 said:yep sorry
trek97 said:Can anyone recommend a decent quality mic that will read down to .001mm. That wont break the bank.
My crappy digital only reads to .01mm - .0005inch.
deviant said:I have some Mitutoyo I can send ya. I get them from my mom when light shines through the tip. They're dial though, not digital.
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teazer said:Not sure that my Micrometers, read down that far. That's half a thou and mine are marked in thousandths and can be interpolated to 1/2 a graduation, but it's all about the feel.
If you have the dimensions of your current needles I can check my tables of Mikuni needle dimensions to see if there's anything close. I need overall length, length to where the taper starts, base (root) diameter, and diameter every 5mm from the top down to do a look up. I would expect to be able to find a fatter/longer Mikuni needle that you can use to turn down.
Honda (Keihin) slide carbs typically have a 2.60mm needle jet and needles typically are around the same 2.518mm that Mikuni are. Worst case scenario, you can use 7 series needles with 3.0mm root diameter as raw material
i have three sets. One still in an original case. They cost me nothing, but if you don't want a set that's cool.trek97 said:Thanks bro but for now...no dont send them. I looked at amazon and they are pretty $$$.
deviant said:i have three sets. One still in an original case. They cost me nothing, but if you don't want a set that's cool.
Sent from my iPhone using DO THE TON
teazer said:Not sure that my Micrometers, read down that far. That's half a thou and mine are marked in thousandths and can be interpolated to 1/2 a graduation, but it's all about the feel.
If you have the dimensions of your current needles I can check my tables of Mikuni needle dimensions to see if there's anything close. I need overall length, length to where the taper starts, base (root) diameter, and diameter every 5mm from the top down to do a look up. I would expect to be able to find a fatter/longer Mikuni needle that you can use to turn down.
Honda (Keihin) slide carbs typically have a 2.60mm needle jet and needles typically are around the same 2.518mm that Mikuni are. Worst case scenario, you can use 7 series needles with 3.0mm root diameter as raw material
crazypj said:I have a 'cheap' micrometer reading to 1/1000 of mm (0.001mm), used to work at a place where standard tolerance was 0.003mm on some parts.
Turning needles isn't easy on small sizes used in 360, probably easiest thing is to use fine emery and polish to size.
The Kei-Hin needle has a 'step' to locate in slide then reduces in diameter.
Problem then is it's real difficult to get two identical (been there )
Anyway, measured a few needles
Major dia, 2.910~2.921mm (roughly four thousandths of inch, 0.004" variation so not critical)
'root' daimeter2.435mm new.
Tip diameter, approx 1.5mm from end in no particular order
1.115~6mm (403302 needle) x2
1.021~1.028mm (404004 needle), x3, obviously one of the three is worn
1.010~ 1.020mm (404002) x7 variations due to wear
Tip diameter of 'aftermarket' D44Z (x6) showed greatest variation, 1.996~1 1.025mm
I have more needles but got 'bored' measuring them
Oh, BTW, a 1/1000mm micrometer will be a vernier type, extra scale around barrel.
Parallax issues make reading slightly more difficult. (I've never seen a direct reading 1/1000mm micrometer)
crazypj said:.....Turning needles isn't easy on small sizes used in 360, probably easiest thing is to use fine emery and polish to size.
teazer said:That and a cheap pillar drill plus a "generous" helping of patience is all you need. I have "machined" a couple of sets of needles and PJ is correct that getting the same is hard and I would hate to check them on a decent sized optical comparator where the inaccuracies in taper would really show up.
I worked on the basis that close to what is needed is better than stock even if it isn't perfect.
trek97 said:Can anyone recommend a decent quality mic that will read down to .001mm. That wont break the bank.
My crappy digital only reads to .01mm - .0005inch.