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  1. #11
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 6-7 years. Has a total post count of 364. Received thanks 41 times, giving thanks to others 14 times.
    Still doing my research on this (materials, why some have a spring under the take up bearing etc.) but this is how the design is shaping up so far...



    Wal.

  2. #12
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 6-7 years. Has a total post count of 364. Received thanks 41 times, giving thanks to others 14 times.
    Okay, I've been thinking a bit more with regards to the springs under the take-up bearings - an example:

    Click image for larger version. 

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    I take it that the primary job of these springs is to pre-load the top roller to remove any slack and prevent it from flopping about when not under a printing load, with a secondary purpose of perhaps aiding the raising of the roller? Or am I missing something? Will I be making a grave error by omitting these springs from my design? I've seen other presses without 'em - but I want to be sure on their purpose and the pros and cons of having them incorporated.

    I posed this exact question to a press manufacturer over in the States - he got back to me (and I'm grateful for that) but his answer to the spring question was a rather vague 'yes'. Hmm... yes as in the springs do that job, or yes as in you're making a big mistake by omitting them from your design..? And with regards to getting some general advice on material specs - well - here's what I managed to extract from him:

    You have to pick the right material with the proper thickness in the right places.
    Hehe. Blood from a stone...

    Anyway - back to the question - am I missing something with this spring..? Any mechanical engineers here have any thoughts on the matter..?

    Wal.

  3. #13
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,037. Received thanks 224 times, giving thanks to others 5 times.
    Going by that photo, the springs only serve to raise the roller up when tension is removed.

    If you design so just the screws lift the roller, you're likely to get a bit free movement while going from under tension to lifting the rollers. It just means you need to turn the tension screws a bit further to lift the roller.
    By adding suitable springs, it could simplify the screw design, as the spring would hold the end of the screw engaged with the bearing block/carrier.
    You could implement it so both the screw and spring do the lifting.

    Any method will work, it's just you need something to lift the roller, otherwise it could be a bit of a faff getting everything loaded between the rollers.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  4. The Following User Says Thank You to m_c For This Useful Post:

    Wal

  5. #14
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 6-7 years. Has a total post count of 364. Received thanks 41 times, giving thanks to others 14 times.
    Cheers m_c.

    Yeah, it would be nice to have a bit of pre-load on the roller to eliminate any rattle when not under load. I may have to go for a spring pushing down, though (also seen in the wild) - the take up bearing I'm using has a curved underside which complicates getting a spring under there - it'll mean a bit more elbow grease when lifting the roller, but if it's too problematic I can always remove it. Thanks again.

    Wal.

    Sent from my HTC One M9 using Tapatalk

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