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General Category => General Scroll Saw Talk => Topic started by: bluelucky on October 23, 2010, 09:55:05 pm

Title: Dewalt 788 won't quit knocking
Post by: bluelucky on October 23, 2010, 09:55:05 pm

My 788 is only a year old and it is knocking but I can't figure out where at? I have already tried turning the tension rod but it only helped for about a hour and the knocking started again. Any suggestions. I have already done everything suggested on Ricks site too.

Title: Re: Dewalt 788 won't quit knocking
Post by: boxmaker on October 23, 2010, 10:36:37 pm

Michael I do not own a Dewalt,  You said you have already been to Ricks site, I was hoping his site would fix the problem, you could give these a try, no guarantees.
 

http://www.dewaltservicenet.com/Documents/English/Video/788scrollsaw.mov

http://www.fixya.com/support/p976178-dewalt_dw788_heavy_duty_20_variable_spe/solutions

                                                         Mark

Title: Re: Dewalt 788 won't quit knocking
Post by: tinker1 on October 23, 2010, 11:12:19 pm

Dont have a 788, I know when Ive had knocking noise it was in my blade installation being to slack

may find help here also:
(Found these post with people that have simular problem of knocking)

http://forum.canadianwoodworking.com/showthread.php?p=192600%23post192600

tune up guide:
http://www.scrollsaws.com/SawReviews/DewltTuneUp.htm

http://www.scrollsawer.com/forum/tools-and-blades/16443.htm


good luck
tinker

Title: Re: Dewalt 788 won't quit knocking
Post by: jimbo on October 24, 2010, 01:19:05 am

Same set up as the Excalibur you should go back to supplier and get it seen to, the mechanism has to be in balance and is a job for the experts
Jimbo

Title: Re: Dewalt 788 won't quit knocking
Post by: julief on October 24, 2010, 07:07:57 am

The only time I have had a knocking on my ex21 is when I installed the motor a quarter turn off.  It sounds like something is out of whack on your motor.

Title: Re: Dewalt 788 won't quit knocking
Post by: Russ C on October 24, 2010, 07:16:20 am

You should have posted this in "Ask Steve A Question". He is really good with Dewalt saws. Maybe he will see this and have some advice.  8)

Title: Re: Dewalt 788 won't quit knocking
Post by: Dan on October 24, 2010, 09:56:54 am

My 788 only knocks when the TENSION is not set correctly. I have turned the tension rod and now set the tension at 4 on the scale. You my have turned the rod in the wrong direction?

Dan