• Scam Alert. Members are reminded to NOT send money to buy anything. Don't buy things remote and have it shipped - go get it yourself, pay in person, and take your equipment with you. Scammers have burned people on this forum. Urgency, secrecy, excuses, selling for friend, newish members, FUD, are RED FLAGS. A video conference call is not adequate assurance. Face to face interactions are required. Please report suspicions to the forum admins. Stay Safe - anyone can get scammed.
  • Several Regions have held meetups already, but others are being planned or are evaluating the interest. The Ontario GTA West area meetup is planned for Saturday April 26th at Greasemonkeys shop in Aylmer Ontario. If you are interested and haven’t signed up yet, click here! Arbutus has also explored interest in a Fraser Valley meetup but it seems members either missed his thread or had other plans. Let him know if you are interested in a meetup later in the year by posting here! Slowpoke is trying to pull together an Ottawa area meetup later this summer. No date has been selected yet, so let him know if you are interested here! We are not aware of any other meetups being planned this year. If you are interested in doing something in your area, let everyone know and make it happen! Meetups are a great way to make new machining friends and get hands on help in your area. Don’t be shy, sign up and come, or plan your own meetup!

Recent content by Johnwa

  1. Johnwa

    LF: Model Engineer & Workshop 2001 Autocollimator project.

    @Gennady Even after skimming the MEW articles I still have no clue what this device is good for! Can you provide a “grade 6” explanation?
  2. Johnwa

    molten metal temp

    I did find similar numbers ranging from about 0.04 to 0.19 depending upon the alloy. These were all for solidified aluminum. This morning I did find this. https://www.williamsonir.com/aluminum/
  3. Johnwa

    molten metal temp

    As far as I’ve been able to find out the non contact pyrometers won’t work with aluminum. They depend on much IR is emitted but molten aluminum IR emission is remarkably low.
  4. Johnwa

    CA-ON Bentone 34 or other “organophilic” clay?

    @Ogmios Forge what are you using for a muller? John
  5. Johnwa

    5C collet set Calgary $75

    https://www.facebook.com/marketplace/item/1689000901958344/?
  6. Johnwa

    John W’s tool grinder

    Dan I used thin wall aluminum tubing filled with sand for cores. The tubing will end up being bored out. John
  7. Johnwa

    John W’s tool grinder

    Peter I have a large stash of aluminum. Most of it is is from Toyota transmission cases. Factory castings are the correct alloy and don’t require any additives like silicon or copper. I used the prints like normal wood patterns so no burn out. The molds are rammed green sand. The thickest...
  8. Johnwa

    John W’s tool grinder

    Here’s a pic of a failed casting.
  9. Johnwa

    John W’s tool grinder

    This picture is a closeup of the rocking lever casting. I used a 3D printed pattern with no attempt at post processing. It didn’t pull cleanly from the sand but otherwise was fine.
  10. Johnwa

    John W’s tool grinder

    The attached picture is the castings so far. Patterns for A&B were made the traditional way using wood and bondo for a filler. They took lots and lots of sanding. The other patterns were 3D printed and only required a bit of post processing.
  11. Johnwa

    John W’s tool grinder

    I initially started casting aluminum about 25 years ago, but haven’t done much in the last 10 years. With a few different threads discussing metal casting, I caught the bug again. I need projects that are useful when done. Otherwise I lose interest and end up with something half finished. I...
  12. Johnwa

    CA-ON Bentone 34 or other “organophilic” clay?

    I’m not positive, but I think it was Bre Chem supply. They have several locations in western Canada. I got it in Blackfalds Ab. I split the bag with a couple of members from the AMEN group in Edmonton. I don’t know whether they had any luck with it.
  13. Johnwa

    CA-ON Bentone 34 or other “organophilic” clay?

    I did get if from a drilling supplier. I believe it is the silica content that may be carcinogenic. Bentone 34 has the same warning. I do know that it forms a gel with oil. Just mixing it with sand didn’t work. I never did get a chance to try it in a muller.
  14. Johnwa

    CA-ON Bentone 34 or other “organophilic” clay?

    I might have some Bentone 910.
  15. Johnwa

    Ancient Myford Lathe - South Shore NS - $100

    Link works for me.
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