Re: segmented pressure beam for AD 951?
|
David,
Thanks for the clarity.
Imran? On Feb 19, 2020, at 8:17 PM, "david@..." <david@...> wrote:
? Let’s see if I can add some clarity here. ? I have a Dual 51 which is basically an AD951 with a different fence. ?I have the “sectional pressure bar” and rubber infeed & outfeed rollers. ? Here’s a photo from the top - planer infeed end is at the top:
All those grey lever gizmos are spring loaded and they individually push down on the material coming into the planer, and each is individually adjustable in terms of spring tension. ? They all pivot on a common shaft. ? The advantage of this setup, compared to the non-segmented system is that material of different thicknesses can be fed simultaneously (within a range of about 8mm variation). ?I find this particularly useful when bringing roughly ripped stiles and rails all to a common width, feeding them on edge next to each other in rapid succession. ? Without this segmented pressure system, a single sheet of spring steel is pressing down on the material being fed and the tallest portion or piece of that material will force the entire plate upward, leaving some areas or pieces without downward pressure. ??
In the following photo you can see in Blue where the the individual segments add downward pressure to the incoming material just ahead of the cutterblock. They also act as a chip breaker.
The following photo is the underside of the planer infeed end. ? The segmented pressure elements are outlined in Blue again here, but the anti-kickback pawls are outlined in Red. ? A planer with the standard (non-segmented) pressure bar has the same series of dangling anti-kickback elements.
Here is the parts diagram. ? The Green #17 is the standard single-plate pressure bar. ? The Red #21’s are the anti-kickback pawls. ?The blue #31 and associated components is the optional “sectional pressure bar”.
Here is the parts description. ?According to Google Translate on my iPhone (what a marvel of technology), #17 is “Smooth preassembled pressure beam”. ? #21 is “Antikickback device”, and #31 is “Welded segment block”.
David Best
Isn't what you are showing the anti kickback pawls? On Wed, Feb 19, 2020 at 7:56 AM imranindiana via Groups.Io <imranindiana= [email protected]> wrote: ?The only similar option I am aware of is what Felder calls “sectional pressure bar”, shown below:
<1559-gliederdruckbalken~-~540w@...>
I thought this is what we are discussing. OP should clarify if he meant something different.
Can someone post what the alternative looks like? I assume it is just a chip breaker.
Imran ?Imran, yes to the noise but I am also under the impression from Felder that the sheet steel pressure shoe (Felder calls it that) had the wrong bend angle on that part causing the harmonics ( like to say squealing pig noise). Will find out next week with my replacement machine which will be newer build by a year. The noise can be minimized by waxing which I never did and I found another hack which was to put a piece of duct tape on it which helped a lot.
I personally would go for the segmented pressure bar and maybe the rubber rollers hear they are great for delicate work there was a recent (maybe 2 months?) about this,
Actually edit, not so sure about the advantage of the segmented pressure bar, I keep mixing it up in my head with the segmented infeed roller that my scm had which was great for small diff in size...
Regards, Mark On Feb 19, 2020, at 12:25 AM, imranindiana via Groups.Io <imranindiana=[email protected]> wrote:
? Are the issues people reported here with noise due to not having the segmented pressure bar? Another advantage of segmented pressure bar (per Felder) is planing of thinner stock.
Another option discussed here is the infeed roller with mixed feedback. The rubber coated one requires maintenance but the metal one may leave marks when taking light passes.
My Dual51 has segmented pressure bar, metal infeed roller and tersa head. I love tersa head, have no complains with metal infeed roller. If there are any marks they do not require any additional high grit sanding than I normally do. It is mentioned here that re-coating rubber infeed roller is, IIRC, $200-$300.
Imran On Feb 19, 2020, at 9:43 AM, David Kumm <davekumm@...> wrote:
?
Most planers over 20" have the segmented chipbreaker ( pressure beam ).? When I buy used, those parts and springs are the first to have problems but if buying new, not an issue.? I'm to the age where chasing multiple pieces back and forth doesn't appeal to
me and I don't do enough volume that I care about the flexibility of that option.? If it comes to money, I'd take the second outfeed roller or a Tersa or spiral head.? I'm a Tersa first, spiral second guy but I'm in the minority.? I'd also put the extra cash
into a bigger dust collector.? Dave
Lining up my wish list for the AD951 and KF 700, with the help of forum members I am clear on the overheadhead guard for the KF, and saving $750 (much needed) by not getting the integrated adjustable rollers in the bed of the AD951. Now I am looking at
the?segmented pressure beam for the 951. Anyone have experienced advice about it? Many thanks!
--
|
imran