[GreenKeys] 180502 Parts

[Pete Lancashire]

My 2cents + order coming soon

I suggest not using WD-40 on any elastomers, polymers, rubbers, etc where
it will remain in contact for an extended period.

There are many silicone sprays, liquids, etc. that are 100% stable when in
contact with the above. If I was selling a device that
contained any of the above and WD-40 was used where it wound remain in
contact, the warranty would be voided.

And if a base silicone is not enough there are PTFE+Silicone compounds.

-pete



On Tue, Sep 9, 2014 at 7:12 AM, David Tumey via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Rob,
>
> Wayne and I noticed during the design phase that there is a considerable
> amount of variation in the dimensions of the hammer from machine to machine
> and in particular, the grove beneath the "face" of the hammer.  Because of
> this, the fit of the part will also vary from hammer to hammer.
>
> On the tight-fitting hammers, a thorough cleaning is essential and the
> addition of a little silicone (sprayed onto a fingertip and applied to the
> bottom of the rubber head) or WD40 will permit easier installation.  Once
> installed if you twist the part several turns in either direction, it
> should seat properly.
>
> In all the tests we carried out, the hammer did stay in position correctly
> and the wear pattern was acceptable.
>
> Also, we had to increase the durometer of the part to make it more durable
> which also makes it more difficult in some cases to seat it correctly.
>
> What is certain is that of the 4-5 iterations of the part we tested (each
> with small dimensional tweaks), the current part is the best fitting we
> could find across all the test machines - Wayne you might want to chime in
> on this as you did the bulk of the in-use testing.
>
> thanks.
> --dave
>
>   ------------------------------
>  *From:* Robert Jarratt <robert.jarratt at ntlworld.com>
> *To:* David Tumey <davetumey at yahoo.com>; "greenkeys at mailman.qth.net" <
> greenkeys at mailman.qth.net>
> *Sent:* Monday, September 8, 2014 2:52 PM
> *Subject:* RE: [GreenKeys] 180502 Parts
>
> I tried one of the early test samples at the weekend. My Model 33 still
> had the original hammer head which turned out to be a strange mixture of
> gooey and hard. It was messy getting it off, I  ended up with black goo
> under my fingernails, some of it is still there 24 hours later.
>
> The rest of the cleaning I did with Isopropyl Alcohol. First using a paper
> towel for the bulky bits, a small screwdriver to get into the corners, and
> finally some string and some dental floss soaked in Isopropyl.
>
> Getting the new part installed was ok, but it didn't go on really snugly
> until I used a bit of WD40.
>
> Regards
>
> Rob
>
>
> ------------------------------
> From: David Tumey via GreenKeys <greenkeys at mailman.qth.net>
> Sent: ‎07/‎09/‎2014 17:12
> To: greenkeys at mailman.qth.net
> Subject: [GreenKeys] 180502 Parts
>
> I am shipping Rob Jarratt 100 pcs for distribution in Europe.  Will try to
> get them out this week.
>
> We will see how that works.
>
> thanks.
> --dave
> W5DT
>
>
>
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