materials

Discussion in 'Fiberglass and Composite Boat Building' started by grady, Jul 23, 2015.

  1. grady
    Joined: Oct 2006
    Posts: 503
    Likes: 11, Points: 28, Legacy Rep: 70
    Location: Scituate, Ma

    grady Novice

    Hey folks, I have a question on steering componets and various materials to make them.

    I'm currently removing the upper plate rudder bushing (bearing) which sits on a rudder shelf. On my twin engine diesel powered sporty. The old cast iron 4 bolted thing seemed to work fine just a little unsitely. but it has attached its self pretty good to the stainless rudder shaft. while looking for a replacement I found a company Tidesmarine that makes a bearing out of UHMW-PE which stands for ultra-high molecular weight polyethylene. UHMW is extremely durable, abrasion resistant and does not absorb water. It’s coefficient of friction (when water-lubricated) approximates that of Teflon in these bearing products.

    Any truth to this statement? These things any good? anyone using these with good results?

    here are links of both types

    Old: http://www.farmbearings.com/product-p/rcj 1-3-fslash-4 timken.htm

    New: https://www.tidesmarine.com/tides-marine/upper-rudder-bearing-std


    Thanks

    Tony G.
     
    Last edited: Jul 23, 2015
  2. grady
    Joined: Oct 2006
    Posts: 503
    Likes: 11, Points: 28, Legacy Rep: 70
    Location: Scituate, Ma

    grady Novice

    Please forgive misplacement of post, it doesn't really fit into any category.

    Tony G.
     
  3. gonzo
    Joined: Aug 2002
    Posts: 13,314
    Likes: 323, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    It is a very good material for bushings. I am not sure how it works as a ball bearing though. Seems like they would creep under constant load and deform.
     
  4. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 470, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    UHMW and the other polyethylenes are indeed well suited bushings. I use HDPE and HMPE regularly, particularly to get their self lubricating properties. These types of plastics (and other polymers) are currently employed in most ball bearing blocks, track cars and other high load situations. Delrin, Celcon, Ramtal, Duracon are common brand names for acetal (polyoxymethylene or POM), which is the usual choice for high stiffness, low friction, resistant to deformation plastics, employed in this manner.
     
  5. grady
    Joined: Oct 2006
    Posts: 503
    Likes: 11, Points: 28, Legacy Rep: 70
    Location: Scituate, Ma

    grady Novice

    Thanks guys...... good to know.

    Has anyone uses the bearings from Tidesmarine?
    any history on the company?

    can anyone recommend a brand.

    Thanks again

    Tony G
     
  6. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 470, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Tidesmarine has been around for about 20 years and specializes in products that employ these high density plastics. I think much of their business is with the dripless shaft seals, but they have other products as well. If they weren't doing a fairly reasonable job, they'd have died a while back.
     
  7. grady
    Joined: Oct 2006
    Posts: 503
    Likes: 11, Points: 28, Legacy Rep: 70
    Location: Scituate, Ma

    grady Novice

    Thanks Paul, I'll do some more research and see what I can find.

    Thanks

    Tony G.
     

  8. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 470, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    What are your fears Tony? They're pretty well known in my area, but this just might be that they're local.
     
Loading...
Similar Threads
  1. mberry
    Replies:
    11
    Views:
    976
  2. PPRINT
    Replies:
    7
    Views:
    1,473
  3. silentneko
    Replies:
    2
    Views:
    991
  4. tunnels
    Replies:
    21
    Views:
    3,069
  5. Nicholas Clark
    Replies:
    12
    Views:
    1,862
  6. packsail
    Replies:
    27
    Views:
    5,290
  7. sandusk
    Replies:
    10
    Views:
    5,158
  8. Islander11
    Replies:
    14
    Views:
    27,850
  9. cattlehound
    Replies:
    4
    Views:
    1,441
  10. leaky
    Replies:
    5
    Views:
    1,578
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.