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  1. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Gents, thank you for all the replies. I do agree that AC seems to make the most sense and the cheapest option here. With a DC servo the PSU needs to be rather huge, there's the driver and on top of it all the gearbox. Main issues with AC are size and noise. I might need to have a second look at...
  2. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Hi zekeman, thanks for your input. Your way of thinking is roughly the direction I was going in. Get a brushless DC motor / servo and couple that with a gearbox (was thinking planetary 10:1 or 15:1). The main problem was: 1. DC power supply - mostly due to the amount of current needed by the...
  3. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Hi Bill, 10-12Nm is what I managed to measure on one occasion with a torque wrench and this was with a jam-up, so effectively the maximum torque required. The shaft is 25mm, body is 15mm ali, should take quite a lot of abuse before things start falling apart. To be honest it's hard to get a...
  4. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Gents, thank you for all the help so far. A bit more detailed info on the requirements, to answer zekeman's questions 1. how fast you need to perform the task I thought 250RPM covers this, this will effectively limit the speed of operation 2. how often This varies, I'd say every few...
  5. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Gents, again, thanks for taking the time to reply. I've looked at the robot stuff, actually I have a robot brushed DC geared motor, which can do 2.3Nm max at 480RPM and I can squeeze a 2.5:1 ratio done via HTD 5mm pitch 15mm wide. What this means is I get around 6Nm at around 200RPM, which is...
  6. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Hi KllrWolf, thanks for taking the time to reply. Here's more info, which I should've included in the original post: - AC or DC, doesn't matter, but I'd rather have a quieter motor, which I think steers this into DC direction. - with DC it would be preferably 24VDC, although 12VDC and 48VDC...
  7. tjagiello

    low speed, high torque - 250RPM @ 12Nm

    Hi everyone, can someone recommend a motor solution to achieve 250RPM at 12Nm ? I'm looking for an off-the-shelf solution and the least amount of parts / devices involved. Torque requirement is momentary, I don't need 12Nm constant running torque, more like peak torque for 1000ms or so...
  8. tjagiello

    stiffness of L shaped construction - monolith vs. two part assembly

    Hi everyone, I'm working on a machine which is mounted in an L shaped enclosure and I'm wondering which of the following configurations is more stiff: The left one is a config with two up-side-down L parts being the sides and multiple rectangle shaped parts locked between it. The right one...
  9. tjagiello

    water mixing 'on the fly'

    Hi JMW, thanks for your reply. Can you recommend any manufacturers for valves that can be used for mixing? would a simple needle valve on the cold water supply line work, as in adding cold water to cool down the hot stream? The hot water will be coming from a PID controlled boiler, so it...
  10. tjagiello

    water mixing 'on the fly'

    Hi guys, I was wondering if anyone has any experience with water mixing 'on the fly', which is basically changing the output water temperature quickly by adding cold water to a normally hot water line. I'm looking at a range of 88-94*C, flow rate of around 180ml-300ml when the whole process...
  11. tjagiello

    boiler safety measures

    I've posted some questions in the electrical section of these forums: http://www.eng-tips.com/viewthread.cfm?qid=265034 and it's been suggested to post here as well for additional pointers, so here we go. I've got a small boiler (200mm wide, 100mm dia) which has an 3/8" inlet hole, a solenoid...
  12. tjagiello

    heater power loop - break SSR control signal or power

    Hi amptramp, I understand the damage it can cause, but with a fitted thermal protection cut-out and an over pressure valve set to 12bar it should fail safe, right? Sure those protection devices can fail and it will blow anyway, but anything an fail really. In idle mode it will be sitting at...
  13. tjagiello

    heater power loop - break SSR control signal or power

    Hi guys, the boiler is going to be fully filled with water as it's going to be sitting at around 93*C-95*C, so I can't really put a relief valve on it, other than an OPV. Water under 9bar of pressure will be moved through the boiler, so it's mostly going to act as a heating device (to disperse...
  14. tjagiello

    heater power loop - break SSR control signal or power

    Hi guys, thanks for the tips! Ok so to sum up: - the second switch will be a 16A sealed switch (just for additional protection as it might operate in a wet environment) and will be used to trigger the heater power supply loop. - there is an over pressure valve and a check valve between the...
  15. tjagiello

    heater power loop - break SSR control signal or power

    Hi guys, I've got a 2kW heater which is controlled by a PID done using a suitably rated SSR (actually a bit over-the-top one as it's 50A, but I didn't want to buy another lower-rated one). This is inside a machine which has other PID controllers, two solenoid valves and some electronics, all...
  16. tjagiello

    thermal isolation for a boiler mount

    Thanks Graham, I've actually decided to mount the boiler slightly suspended, so that the only point of contact are the M10 buts/bolts holding it. It's not heavy and this should work properly. Regards, Tom
  17. tjagiello

    thermal isolation for a boiler mount

    Hi everyone, I’m mounting a stainless steel boiler (quite a small one, roughly 20cm dia, 30cm wide) on a small frame made out of 1.5mm stainless steel flat and L shaped pieces. Because the boiler is going to be heated up to around 95*C for quite a while I’d like to put something between the...
  18. tjagiello

    leaking NPT joint on a rotary pump

    Hi guys, yes there is a small kink/crank in the top part of the thread which is what causes the tape rip and leaks. I guess there's no other way than liquid sealant, although I will wait and see what the company technician says. Regards, Tom
  19. tjagiello

    leaking NPT joint on a rotary pump

    Hi Latexman, yup definitely NPT, it even says so in the manual. I'm still not sure why the manufacturer of this pump (Fluid-o-tech) doesn't recommend liquid sealants. Regards, Tom
  20. tjagiello

    leaking NPT joint on a rotary pump

    Hi, nope no way to correct that as I haven't got the tools. Plus it would probably be quite tricky without getting anything inside the pump. Regards, Tom

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