[Homeroast] Trouble roasting today...

Rich rich-mail at octoxol.com
Sat Jun 12 22:15:48 CDT 2010


That is a pure silicone grease.  will not work.  The gears are a high 
temp nylon so you have to avoid some lubricants or the nylon will get 
brittle.  And they may not be nylon, just looks like it.

Phil Palmintere wrote:
> just "thinking out loud" here... i wonder if the thermal grease used
> between a computer's CPU and its heat exchanger would work.
> 
> On 6/12/10, Rich <rich-mail at octoxol.com> wrote:
>> There are several lubricants that would work but they basically have to
>> be a thickened oil and not a conventional soap based grease.  That
>> little gearbox gets right hot as the drive shaft transfers the heat
>> right back inside of the gearbox and just slowly vaporizes the grease.
>> This tends to ague against a silicone based grease as it will vaporize.
>>   To get the original out and back in you have to capture the 2 nuts and
>> that is a trick.
>>
>> I have no idea how much of an issue it actually is but the one I have
>> here failed from lack of adequate grease.  It would still run until it
>> got hot and then it quit.  The replacement also has a bit of free motion
>> between the gearbox output shaft and the drum drive coupling while the
>> original is tightly pinned with a roll pin.  Keep in mid that the
>> roaster i have came over in the first batch.  I suspect that things have
>> been updated a bit in the intervening time.
>>
>> Tom & Maria - Sweet Maria's Coffee wrote:
>>>> Removal and replacement is a real job with the early ones.  You have
>>>> to use a 500F or above drop point synthetic grease.  Something from
>>>> Nye Lubricants works well.  Figure it will be close to 100.00 for the
>>>> grease though.
>>>>
>>> !!!  I have a few different lubricants I use on roasters that can handle
>>> high temps and don't cost that - I am sure that is amazing grease, but
>>> since it is not a food contact point it seems there might be other
>>> options. Glad to see this topic come up though, I didn't realize that
>>> there was an issue with lubrication, esp on early models.
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