hammers

[Allen Wright]

Richard,

Both these documents I've mentioned are I suppose what you'd call 
engineering drawings (rather than just specs), by the way. Not sure I 
made that clear.

Allen
On Friday, March 12, 2004, at 08:00  PM, Allen Wright wrote:

> Richard,
>
> When I replaced the hammers on a Baldwin L a few months ago Renner was 
> nice enough to send me a copy of the original factory specs (ca. 1956) 
> for hammer boring (76 degrees 1-20, 80 degrees 21-34, etc. etc.). I 
> graduated the bore angle rather than make it jump in segments, but 
> still it was interesting to have the original specs on hand to 
> consider and tweak as necessary or preferred. It also gave the boring 
> distance for bass and treble.
>
> I also have a very interesting copy of the Steinway specs for their 
> hammers (all models). It's a side-view drawing of note #1 hammer, the 
> last bass hammer, first treble hammer, and note #88 hammer, and which 
> shows the putative boring dimensions, overall length of their hammers, 
> shape of the tail coving, etc. This document is (by coincidence) also 
> from 1956. Factory hammers that I've bought over the last decade or so 
> match these profiles remarkably accurately: I suppose because the same 
> hammer press has been used (I can hear some Steinway skeptics groaning 
> in disbelief). This spec sheet doesn't give recommended boring angles, 
> however.
>
> This isn't quite the "published list" you're wondering about, but I 
> mention them by way of making the point that these sorts of documents 
> are out there. It would be interesting if (as you suggest) they could 
> be put together in one place so that rebuilders could refer to them. 
> We might not necessarily abide by the specs, but it would be good to 
> know exactly what we're respectfully disagreeing with. Sort of like 
> the old book of regulation specs we all referred to when we were first 
> starting to regulate.
>
> I suppose I could scan these if anyone is interested. Never sent 
> anything I've scanned before but I could probably figure it out!
>
> Allen Wright
> Cincinnati, Ohio
> (Northern Kentucky University)
> On Friday, March 12, 2004, at 12:17  PM, Richard West wrote:
>
>> Hello, All,
>>
>> Does anyone know of a published list of hammer angles for a variety 
>> of popularly rebuild pianos, i.e. Steinway, M&H, Baldwin, etc.?  I've 
>> replaced several set of hammers over the years and have always 
>> wondered what the factory specs were for bass hammer angle, and the 
>> fan of the tenor to treble hammers.  I've just always bored hammers 
>> to match what I find on the particular piano I might be working on.
>>
>> Richard West, University of Nebraska
>>
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