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  1. Dudely7

    Material choice for side-loaded sliding shaft support?

    Hello, we have non-rotating mild steel shafts (1.625"OD) that will be sliding through a firewall back and forth up to 4". Periodically, side loads of several hundred pounds will push the sliding shaft against a 4 bolt flange on this 'firewall'. The flange ring will hav an oversides bore to...
  2. Dudely7

    Tivar UHMW-PE Eco-recycled properties

    Hi, I know this probably isn't the right section to ask but I am curious about Tivars reprocessed line of UHMW, in comparison to their virgin material, and if I would be able to trust reprocessed material from this company (Quadrant Engineering)? Use will be flat stock machined to small flanges...
  3. Dudely7

    Balancing speed of telescopic cylinders?

    I'm looking for a cost effective, simple method to balance actuation speed of a pair of telescopic cylinders off a single speed gear. Could someone point me towards the type of circuit I would need? Slowing the 2nd stage to match the first stage might be an issue of adding and adjusting a...
  4. Dudely7

    Compressing Factory Coiled Springs

    Its really hard to predict the outcomes if you havent experimented with this alot. If I were to offer economic lowering services, an old prefered method is to cut a certain mount off the spring with a hot flame (oxy acetylene torch) and use the heat to quickly force the cut end down,for a...
  5. Dudely7

    Needing a big bore misaligning bushing

    Hello, I'm trying to come up with a vertical shaft support (non rotating) bushing with decent misalignment capabilities on 2 specific bore sizes; 1.625 and 2.00" The bearing only needs to support minimal side loads and the only thrust loads will be friction between the shaft, as there will be...
  6. Dudely7

    2 Functions with single pump?

    Yes, my problem with selecting a gear is the endheads we are using are completely flat, milled only for the shaft seal to fit snuggly (like Stone brand pumps), and I have no idea how to order a gear that will fit with proper shaft length. they have a series but the ports are not boss or npt, and...
  7. Dudely7

    2 Functions with single pump?

    I am needing to do the following functions with the avalibility of a single dc motor: evenly lift pair of cylinders with even loads,simultaneously, lift and gravity lower each cylinder independently while the other remains closed, gravity lower cylinders,both simultaneously and independently. I...
  8. Dudely7

    Gearpump Suction Side Question

    I'm not expert or even a novice,but I know for a fact, if I went and plugged a complete pump to the inlet of the gear, it will shoot fluid straight through it.. BACKWARDS. what other reason would it have to make 2 90* turns, follow the half circles, and make another pair of 90* turns when it...
  9. Dudely7

    Gearpump Suction Side Question

    Thanks for the replies. Gives me somthing extra to think about. The 'island' in between the suction ports could radius up to make contact with the teeth in between the ports if that means anything to anyone. What we're wanting to accomplish is: having a gear identical or very similar to the...
  10. Dudely7

    Gearpump Suction Side Question

    Hello all. I've browsed these forums before, never posted until now. My question is concerning the suction port of external gear pumps. On most, I notice there is a certain degree cut out of the gear wall,lets say 3/4" for a 3/8-1/2" port, thats typically equal on the pressure side and suction...

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