Imran, good summary. ?How did you tension the main drive belt? ?My Dual 51 motor shaft snapped off because the early machines from the factory had belt tensions set way too high. ?After replacing the motor,?
and several back-and-forth exchanges with Felder about how to know the belt was properly tensioned, the consensus was that when plucked, the belt should resonate at 160 Hz. I scratched my head how I was going to know if the belt was vibrating at 160 Hz. ? Then I decided to translate that to a key on my piano, recorded that sound on my iPhone, then did the belt tensioning to match what I was hearing on the iPhone in the shop. ?Today there is an app for the iPhone that will display the frequency of any sound it¡¯s hearing. ? It is especially good at suggesting when my cocktail ice clinking together is at the right temperature.
David Best
https://www.instagram.com/davidpbest/
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?Thought I document some details of my service effort on Dual51. In case of Dual51 the electrical cabinet in the rear of the machine needs to be removed to get access to cutterhead drive belt and feed rollers. Inside the electrical cabinet, there is a ground wire that is screwed into the back wall (and therefore the chassis behind it) of the cabinet. This ground wire screw has to be removed to remove the electrical cabinet. This is not mentioned in my manual and was a source of great frustration first time around. Once the back is exposed you will see something like this (this is actually the after pic):
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There is a removable link in the chain but be aware that putting the chain back by your self is bit of a pain. I was able to do it but it will go much quicker with a helping hand.
Once chain is removed it can be cleaned thoroughly and removing it allows good access to all sprockets.
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My manual says use machine grease for chain and related parts but I just used shaper spindle grease which actually appears to be a bit viscous for the chain, at least at 50F shop temp. I wanted to ensure that the chain rollers got greased so I used the heat gun from a distance to warm things up a bit.
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I wiped access grease off. The drive belt looked fine so I closed the rear up.
Next, I removed the covers on both sides under the planer bed. There is a grease zerk for each bed elevation post. I used Felder grease gun to pump grease into these. I continued pumping expecting the grease to come out up top but nothing did then realized that it is actually coming out from underneath. It is not easy to see what is happening below as there is a grill. As I write this, I realize that I could have removed this grill but it did not occur to me to do so at the moment. Once I realized that grease comes out from bottom. I lowered the planer bed causing some of the elevation post to extend below the chassis floor and pumped some more. This way the extra grease actually goes on the post and when the table is raised/lowered a few times it lubricates the post.
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There is a chain that drives the sprockets on all posts. Red arrow points to this chain. It looked good so I did not feel the need to clean and lube.?I wiped all excess grease, especially below the chassis floor as dust can get to the extended posts.
Hope this is helpful.
Imran
David P. Best