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Question for the CNC guys

Discussion in 'RD's Lounge' started by WYRD, Oct 3, 2019.

  1. WYRD

    WYRD Well-Known Member

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    I'm in need if 5 or so aluminum paddles similar to a ping pong paddle. Thick enough to stand up to repeated solid swings of a single Jack hammer against PVC pipe. Doesnt need to be precise fancy as it's just used to smack 5in PVC together. Who would I go to to fab this and what should I expect to pay?
     
  2. RiverDave

    RiverDave In it to win it

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    Why would you want something precision for this?

    I’m not sure I understand the single swing of a jackhammer?
     
  3. redone76

    redone76 Well-Known Member

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    Think 1/4" thick aluminum would work? I also have 3/8" thick in stock. H32 and T6. I can draw up and laser cut you something pretty quick. Post up a rough sketch.
     
  4. LHC Kirby

    LHC Kirby LifeTime Member

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    paddle.jpg

    LOL
     
  5. WYRD

    WYRD Well-Known Member

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    Basically yes just like a ping pong paddle handle you hold with a flat round head to smack with a sledgehammer. 1/4 inch would Bend 3/8 might work though
     
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  6. WYRD

    WYRD Well-Known Member

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    Not looking for precision just something without sharp edges as it will be handled regularly.

    Single Jack is a small handheld sledgehammer we use it to smack the end of 5 inch PVC 20 ft length. Usually my guys just use a piece of wood but I've seen other contractors use something similar to what I'm trying to make and it seems to work well
     
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  7. ltbaney1

    ltbaney1 Well-Known Member

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    sounds like you need someone with a waterjet or plasma table.
     
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  8. Yellowboat

    Yellowboat Well-Known Member

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    Sounds like you need just a basic fab shop.
     
  9. CoolCruzin

    CoolCruzin Well-Known Member

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    Want a ping pong paddle made in alum / steel let me know .
    Expensive but would be a cool project
     
  10. WYRD

    WYRD Well-Known Member

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    20191003_165303.jpg
     
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  11. WYRD

    WYRD Well-Known Member

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    What's considered expensive?
     
  12. Yellowboat

    Yellowboat Well-Known Member

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    Just wondering why are you having to hit them with a hammer to get them to go together? Most 5" stuff is still solvent based glue stuff. When everything is correct they should be very easy to go together. Now years back I did get some fittings that were out of spec, way too tight. Might want to check your measurements on your pipe and fitings.


    If it's sch 40 ( and iirc) the pipe should be 5.563" and the fittings should be 5.565
     
  13. Bobby V

    Bobby V Well-Known Member

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    Are you trying make the bell end go into the spigot end. Kinda like this video.


     
  14. WYRD

    WYRD Well-Known Member

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    When the lengths are 20' sometimes they take a little persuasion
     
  15. WYRD

    WYRD Well-Known Member

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    Yes but for electrical conduit, no rubber o ring
     
  16. Yellowboat

    Yellowboat Well-Known Member

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    Conduit changes everything. Belled ends are notorious for being undersized. So much so that they sell reamers to resize them, but bohic. I think bosch still makes an attachment for rotohammers that drive them home.

    I will ask the guys tomorrow, the company I work for lays it by the mile.
     
  17. Bobby V

    Bobby V Well-Known Member

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    Above ground or under ground electrical. On UG we use a steel bar that goes into the dirt and then we push the pipe forward. Use a lot of grease.
     
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  18. WYRD

    WYRD Well-Known Member

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    Bs5881ss_Install.jpg


    Underground but in large duct Banks similar to this picture. The guys do you use bars when there's only one row but multiple rows like this you can't get the leverage you need

    * disclaimer not our duct
     
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  19. manxman

    manxman Well-Known Member

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    were are you located? If your near me in San Marcos 92069, I can make something for you. www.mgmplastics.com
     
  20. WYRD

    WYRD Well-Known Member

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    San Bernardino 92410 but it shouldn't be too much to Freight feel free to shoot me a p.m.
     
  21. Yellowboat

    Yellowboat Well-Known Member

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    Another dumb thought, what about a seal driver that is 5.5" those should be cheap.
     
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  22. manxman

    manxman Well-Known Member

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    I would make them out of 1/2" to 3/4" UHMW or HDPE. Wont hurt or waffle the ends of the pvc pipe. Eventually will conform to the ends of the pipe and center on them over time with more impacts. You would probably be looking at $250 to $300 for 5-6 of the paddles. What color do you want?
     
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  23. WYRD

    WYRD Well-Known Member

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    You don't think the plastic would crack by hitting it with a hammer overtime?
     
  24. bldrinker

    bldrinker Well-Known Member

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    Sounds like you need a band saw.
     
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  25. WYRD

    WYRD Well-Known Member

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    they are not dumb thoughts if they work
     
  26. Carlson-jet

    Carlson-jet Well-Known Member

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    a 1/2" X 12" x 12" and an hour with a jigsaw and some wd-40 would get you what you want. You would be surprised how many guys make way more complex things on here with just a few basic tools and a small amount of time. I wish you were closer. I would give you the 6051 plate.
     
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  27. WYRD

    WYRD Well-Known Member

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    water tables and plasmas are much more fun toys to play with
     
  28. Yellowboat

    Yellowboat Well-Known Member

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    Federal mogul makes some that are in the 5-6 " range. They should run you 15-20 for the head and 10 for the shaft. They may even have one that has a shoulder at just under 5.5" which would be perfect for 5"

    Hell with a circle cutting jig and a router you could make them yourself on the cheap out of al
     
  29. WYRD

    WYRD Well-Known Member

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    Only issue I see with those would be hand injuries looking for something more like a paddle so the hand is more out of the way
     
  30. Yellowboat

    Yellowboat Well-Known Member

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    I would trust both of those plastics to last longer then an al one made out of 1/4" plate
     
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  31. Yellowboat

    Yellowboat Well-Known Member

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    That's why they make pilars/ vise grips
     
  32. HitIt

    HitIt Well-Known Member

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  33. redone76

    redone76 Well-Known Member

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    I’ll draw something up tomorrow morning. Laser leaves sharp edges but I can vibe deburr them to round the edges. Unless you want them to have a radius on the handle


    Sent from my iPhone using Tapatalk
     
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  34. manxman

    manxman Well-Known Member

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    every punch press and clicker die cutter uses these materials now. They wont last forever, but they wont damage the end of the pipe either.
     
  35. redone76

    redone76 Well-Known Member

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    How about .375 T6 aluminum? Shit holds engines into boats


    Sent from my iPhone using Tapatalk
     
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  36. getreal

    getreal Well-Known Member

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    images (1).jpeg
     
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  37. HB2Havasu

    HB2Havasu Well-Known Member

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    I would just use a 2x4 and a Rubber Mallet?
     
  38. Icky

    Icky Well-Known Member

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    They make dead blows that big.

    Have you guys ever tried using a come along ? Timber hitch a rope on both ends and put the come along in the middle.
     
  39. monkeyswrench

    monkeyswrench Well-Known Member

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    Jigsaw and white cutting boards, dress the grip with a flapper wheel. Make a couple on the cheap and see if your guys use them, or leave them in a ditch.(the paddles, not the guys)
     
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  40. rrrr

    rrrr Well-Known Member

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    It's a good thing, because I know a guy with electrical licenses in three states, and he was gonna ask if you had done heat calculations on that many conduits in a single duct bank.

    :D
     
  41. WYRD

    WYRD Well-Known Member

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    That is actually a great idea. May have to give it a shot. Thanks :cool:
     
  42. WYRD

    WYRD Well-Known Member

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    That is what they do now. Had one of my guys mention they seen another contractor doing it with the paddles and I thought it might be something to look into
     
  43. Yellowboat

    Yellowboat Well-Known Member

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    A router and a circle cutter is way better the a jig saw. You can make one in about 5 mins if you do not have a circle cutting jig.
     
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  44. Waterjunky

    Waterjunky Well-Known Member

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    The other advantage of the plastic cutting board is that the softer plastic won't ring. Trust me, if it was AL and you smack it good while someone has a hold of the handle, their hand will be totally numb and useless after the first pipe. A metal paddle will ring like a bell and will suck.
     
  45. monkeyswrench

    monkeyswrench Well-Known Member

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    I've used those cutting boards for making profiles on 18 and 20g mild steel...like a buck. Also made some temporary tooling for a friend's Pullmax type power-hammer. They're cheap and pretty durable. The router idea would work good for what you need. I have usually just roughed out a profile with a jig or bandsaw, then filed or sanded pretty. I've used Trex type decking too, but it didn't hold up as long.
     
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  46. rrrr

    rrrr Well-Known Member

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  47. manxman

    manxman Well-Known Member

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  48. Dennis-19

    Dennis-19 Well-Known Member

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    If they don’t need to be precision I could cut them out of 3/8 on the band saw and de bur them
     
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  49. rrrr

    rrrr Well-Known Member

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    In accordance with my tendencies to overthink things and make simple processes more complicated, I submit the following. :D

    I would fabricate the paddles from ¾" thick HDPE, and using both sides of the piece, I'd mill .1875” circular face insets that correspond to various conduit sizes. Undersize and oversize the groove dimensions .125 or .1875 from actual pipe size.

    For example, cut the groove for 3" diameter conduit 2.875 ID and 3.625 OD.

    Make the grooves for 1½" and 3" on one side of the paddle, 2" and 4" on the other side. Smaller conduits could be set with the unfaced center of the paddles.

    Of course, a plain smooth face would be cheaper, but having a milled inset would allow a faster production rate and be a bit safer, since the paddle would be less likely to slip if hit with a glancing blow.


    Schedule 40
    TRADE SIZE / AVERAGE OD (IN) / MINIMUM AVERAGE ID (IN)

    1-1/2 - 1.900 1.564

    2 - 2.375 2.021

    3 - 3.500 3.008

    4 - 4.500 3.961

     
    Last edited: Oct 4, 2019
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  50. Icky

    Icky Well-Known Member

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    Wish I would've known about you sooner, had some plastic welding I needed done that I subbed out.
     

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