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  #1  
Old Mon 30 October 2006, 12:56
Gerald_D
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Noisy Shaft mounted fans on Fimec & HSD spindles

Received two HSD spindles today - except for the colour and cable connector, they are identical to the Fimec. These photos show the the fan arrangement before any modifications:



Air entry is through the grille on the back




The fan is exactly like a typical water pump - sucks in through the center and flings out around the perimeter



The alu body of the spindle is an extrusion with 4 colling holes. All the air just goes straight through the long holes. Nothing exotic.



If you have ever seen a siren, you'll notice that this is the same construction . . .



Easiest option? Remove fan and blow compressed air into the grille area of the cover...... (seal the grille so that no cold air escapes out that end)
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  #2  
Old Sat 13 January 2007, 08:43
dan sutula
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Gerald,
I noticed that the fan on this FIMEC/HSD spindle is of the radial-vane type. I recall from past experience that fans with "backwardly-inclined" vanes are typically quieter. Although - I doubt that the difference would be significant enough in this application, it is perhaps another "angle" to explore.

PS - Outstanding job on the MechMate Project - sharing your knowledge experience and design is a wonderful gift to fellow enthusiasts. Thanks!
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  #3  
Old Sat 13 January 2007, 09:31
Gerald_D
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The really quiet fan is a separate Pabst 3656 fan mounted on the back (same as used by some Colombo spindles) Spec Sheet. This range of fans has a choice of Sintec bushes or ball bearings - the Colombo guys have discovered that the bushes don't work too well.

With my first Fimec, I removed the standard plastic fan off the shaft (it broke in the process) and replaced it with the Pabst. A small duct/adapter was needed.
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  #4  
Old Sat 22 January 2011, 13:03
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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These spindles or the water cooled ones, can they work upside down ? Like on a router table
10router_table.JPG
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  #5  
Old Sat 22 January 2011, 15:13
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
I see no reason why they cannot be used "upside down."
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  #6  
Old Sun 23 January 2011, 00:15
Kobus_Joubert
Just call me: Kobus #6
 
Dalview
South Africa
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Thank's Gerald, so there are no limitation on the bearings by turning it around.
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  #7  
Old Sun 23 January 2011, 02:11
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
The moving part of the spindle (rotor/armature) weighs much less than the cutting forces, so the main bearing loads are not created by gravity. I don't see that dust ingress should be a worry on a properly sealed spindle. I have seen some spindles in tables that way around (direct drive spindle moulders)
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