开云体育

Hi all,

I have an issue with my A3-31 regarding table flatness. This seems to be a repeating topic, but I could not really find a solution. I adjusted the machine following the various tutorials and could get the tables into good alignment. However there remains an issue with table flatness, specifically that both tables are concave near the cutter head, although they are rather straight further outside. Already about 20cm away from the cutter head, the tables are reasonably flat. I filled out David Best‘s table flatness sheet and attached it below. Caution: all values are in mm.

It appears as if the rods marked in the first photo are tensioned a tad too tight, thus deforming the tables. I tried to loosen the tension a little bit on the upper nuts, but that didn‘t change anything.

I wonder if this issue could also be related to the base.?Its made out of 30mm plywood with eight wheels, one under each corner of the board, and one under each corner of the A3. The wheels are specced for 100 kg each.

Best,
Michael

On 21-1-2022 16:44, Michael Kraus via groups.io wrote:

Hi all,

I have an issue with my A3-31 regarding table flatness. This seems to be a repeating topic, but I could not really find a solution. I adjusted the machine following the various tutorials and could get the tables into good alignment. However there remains an issue with table flatness, specifically that both tables are concave near the cutter head, although they are rather straight further outside. Already about 20cm away from the cutter head, the tables are reasonably flat. I filled out David Best‘s table flatness sheet and attached it below. Caution: all values are in mm.

I don't think the flatness of the table is a problem until it affects your result after jointing/planing. You don't mention why you started to investigate this. Do you get good results using the machine?


Regards,


Jonathan

Hi Jonathan,

Thanks for your comment. Indeed I forgot the most important part... my problem is the following:

When jointing narrow stock, say 2~3 inches wide, everything works reasonably well near both edges of the tables, but in the center I get snipe. For lack of a better explanation I attribute this to the recess in the outfeed table, which is 0.25~0.3mm. I have not yet measured if this difference is consistent with the depth of the snipe. I will check this later today...

Best regards,
Michael

This is the situation I have with my hammer a3-31, and why I am upgrading to a minimax fs52es. However, a much bigger issue is that my tables don’t hold settings for more than a few weeks. That was impacting my jointer’s performance a lot more than the out tables. Have you checked that your settings are ok??

This is in fact an issue I seem to have as well, but only more recently. I had to do some minor adjustments about a year after I got the machine, but recently the intervals become shorter and the adjustments less minor.
I readjusted everything on the weekend and other than the snipe issue in the center of the table, the machine works fine - at least for now.
Also, during this adjustment I found a few nuts and bolts loose, that I never touched before and that definitely should not have been loose...

I actually considered upgrading to a minimax fs41es. Unfortunately, it's rather hard to accommodate in my shop. More than 1,8m of jointer tables are really hard to fit in, or at least I have not yet seen how.?Thus my current plan is to move to separates, probably a Robland KS 410 and a minimax s41es. I can place those such that I can do an estimated 80% of my typical work without moving the machines and I have enough room to move them comfortably if necessary.

Best,
Michael