Does Anyone Know A Good Machine Shop?

Discussion in 'Northern Thailand - General Discussion Forum' started by ianyonok, Jun 13, 2018 at 8:08 AM.

  1. ianyonok

    ianyonok Ol'Timer

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    Does anyone know a good machine shop in the north. I'm looking for a truck/car repair workshop that employs machinists who know how to use machines and measuring tools.
    I have a 45 year old crankshaft from a Triumph twin that needs to have the big end journals ground. This requires a large machine specially for the job and a machinist who knows how to use it.
    I did find a shop in Chiang Rai that had a crank grinding machine but there was no-one there who could use it.
    I have heard that machinists here can earn very good salaries, so they must be in short supply.
    Grinding crank journals is a skilled and precise job. You need at least a vernier micrometer to measure up to 0.0001".
    Small bike repair shops and small corner machine shops do not use precise measuring tools but do the machining by "feel and fit".

    20180607_124720. Here is a pic of a crank grinding machine.... for those who don't know what they look like (I had not seen one before). But sadly, this one is just collecting dust...
     
  2. John Aero

    John Aero Ol'Timer

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    While I have had some good stainless steel fabrication done in Chiang Mai (the guy did get confused between metric and Imperial dimension’s though) and a mate has had Ok parts made for his Zundap’s and DKW here I would not want crank grinding done locally. Aside from being a different level of technology if they make an error on a 45 year old crank you will have serious issues. I would bite the bullet and have it done in the “West” - with such an old item would select a specialist old Brit bike shop – Oz, USA, Europe.
     
  3. canthai

    canthai Ol'Timer

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    Years back I tried to find a shop - in BKK even - to grind my HD crank. Sad to say - no luck. Put it down to my non existent Thai language skill maybe.
    Took back to Canada, had it done, into the suitcase, off the bird. Along with all the bearings, seals, case cement, ... Would like to find one here.
     
  4. ianyonok

    ianyonok Ol'Timer

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    I could take the crank to Europe or the States, but really wanted to find somewhere in north Thailand. With the number of vehicles on the roads here, there are many places that do crank grinding. I know of a place in Udon where the machinist knows his stuff and earns 40k Baht a month. There is also a shop in Ubon that I saw on Youtube. Savannakhet in Laos has a machine shop where they do crank grinding. There must be many places in BKK too. I was just looking for a shop in the north.
    On a recommendation from Joe, at Joe's Bike Team, I went to Chiang Mai Yontrakit. It is just off the SE corner of the moat right in the city, at; N 18.78120 deg, E 098.99427 deg.
    Quite a big shop with 2 crank grinding machines that look like they are used almost daily.
    I discussed the job with 2 of the machinsts (my Thai is OK). The senior machinist had a vernier micrometer and knows how to use it. I had the specs in metric and imperial. Shops here are more used to metric.
    The crank was already on the 2nd grind size. Triumph list 3 oversize shell sizes, incrementing by 0.0010".
    So, I could only go to the 3rd grind size. However, I did later find a vendor selling -0.040" shells, so we could have gone another 10 thou but best avoided if possible.
    I picked the crank up the next day and have brought it home. The journals have been polished with something like 400 grit emery. I'll polish them more before building the engine. Now bought a 2nd hand 1-2" vernier micrometer on ebay, so that should be here in a week or so and I can try to properly measure the journals. The spec is +/- 0.00025" so can't measure properly with a regular mic.

    A good sign when I arrived, plenty of engine parts hanging around the entrance to a large machine shop full of machines and quite a few staff in uniform company T shirts.
    2018-06-14 14.05.41.

    The machinist who ground my crank on this machine.
    2018-06-14 14.00.16.

    The second crank grinding machine. Both machines in use when I arrived. 2018-06-14 14.00.22.

    1971 Triumph T100C crankshaft..... The 2 journals before (ugly).. history unknown.
    2018-04-19 15.05.26. 2018-04-19 15.08.26.

    ....and the crank after big ends re-ground...The main bearing journals should clean up OK.
    2018-06-17 14.02.18.

    Joe had a 2nd suggestion and I found Jagkhon Diesel. A very interesting place. Actually, they didn't do crank grinding but specialised in making gears. They also had many other machines, including the long bed lathe on the right here.
    2018-06-15 13.34.43.
    They can make any kind of gear in steel, plastic, bakelite, whatever.
    2018-06-15 13.39.06.
    Interesting pieces; thread cutting, spline cutting and gear cutting done here.
    2018-06-15 13.39.19.
    Heavy worm drive gears.
    2018-06-15 13.39.33.
    If required, when machined, the gears are sent to BKK for heat treatment.
    2018-06-15 13.39.57.
    A gear hobbing machine. A very interesting process (perhaps I'm weird..)
    2018-06-15 13.40.15.
    Jakgkon Diesel is just NE of the moat on the 118 at; N 18.79930 deg, 099.01505 deg.
     
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  5. canthai

    canthai Ol'Timer

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    Super. Will drop by both places and note locations.
    No more overweight suitcases for me !
    Thanks
     
  6. ianyonok

    ianyonok Ol'Timer

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    A couple of other shops in Chiang Mai that I found;

    Wiwat Steel on Bamrungrat Rd, east of the city; N 18.78993 deg, E 098-00883 deg.
    They have steels and no-ferrous metals up to large sizes in round, hex & square bar. Also large pieces of cast alumininum and hollow phosphour bronze bar for bushings.
    One of the best metal stockists I have found.

    2016-01-06 13.51.08. 2016-01-06 13.51.26. 2016-01-06 13.52.02. 2016-01-06 13.59.36. 2016-01-06 13.59.55.
    They also have a 4 mill Baht CNC Waterjet cutting machine. Operating at 60,000psi, it can cut thick plate metal. The machine came from China but the waterjet head and operating system came from USA.
    I had a wheel embellisher for my cafe racer cut out there, from a plate of 5mm thick alumium alloy. The waterjet cutter leaves a pretty good surface which is easy enough to polish up.
    2013-11-11 16.15.33.

    Another place does laser cutting of steel plate. I could get BSA M20/M33 clutch plates made there.
    A little out of the south side of the city at; N 18.73513 deg, E 098.96563 deg.
     

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