To start off, I apologize if this thread has been beaten to death in the past. I've read all the previous posts (I think) but I haven't been able to glean an answer to my questions. I am replacing my 6" jointer (ridgid) with a larger machine (8") as I've recently expanded from my one car to a two car garage shop. I have decided on selecting one of the Grizzly machines and am deciding between three models (0490 parallelogram 8" jointer $795 ; 0586 8" jointer $595 and ; 0593 8" jointer with spiral cutterhead $925).
I realize that the primary advantage of the parallelogram design has to do with ease of bed adjustment. I also realize that the difference between a 2hp and 3hp motor on a jointer probably isn't a big deal (the 0490 has 3 hp).
I'll limit my confusion to just two questions:
(1) The table width on the 0490 is only 8" while that of the 0586 is 9 1/4". I realize the blades are the same size. Does the parallelogram design allow the jointing of 8" boards with only an 8" table or does the non-parallelogram jointer have the capacity to joint a full 8" board while the 0490 can only joint a narrower board due to the presence of the guard on a table only 8" wide?
(2) This issue of spiral cutterheads continues to confuse me. I understand that each insert can be turned four ways to apply a fresh edge. However, isn't it a huge amount of work to change out a large number of these inserts? They also seem very expensive to purchase replacement parts for, although I realize that each unit is good for four "sharp edges." Also, how do you tell which individual insert is dull? With standard knives, I can tell when the unit needs sharpened or new knives by the quality of the cuts. With the spiral head, how can you evaluate individual inserts for sharpness?
The two lower priced machines are in my budget while the spiral cutterhead machine would be a stretch....worth it?
I so appreciate any input you can provide. Thanks in advance.
Rick