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How do I fix the hole that's stripped on my Dewalt 788 lower arm with cover?

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Forum topic by Vinnie posted 01-04-2014 10:55 PM 1916 views 0 times favorited 14 replies Add to Favorites Watch
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Vinnie

100 posts in 2850 days


01-04-2014 10:55 PM

How do I fix the hole that’s stripped on my Dewalt 788 lower arm with cover? Should I use a self tapping screw?

Please help, thanks, Vinnie

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com


14 replies so far

View DIYaholic's profile (online now)

DIYaholic

19172 posts in 2136 days


#1 posted 01-04-2014 11:00 PM

There are a few solutions….

You could re-tap the hole with a larger tap/bolt size.
There are thread repair inserts, they look like a spring that is inserted into the hole.
http://www.rivetsonline.com/thread-repair-kits/individual-thread-size-kits-en.html

Those are the two that I can think of. Your self tapper solution should work also.

Good luck.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

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Vinnie

100 posts in 2850 days


#2 posted 01-04-2014 11:06 PM

Randy, thanks for that info! I think I will get the spring. because I don’t want to use the same screw.
Thanks, Vinnie

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com

View distrbd's profile

distrbd

2227 posts in 1907 days


#3 posted 01-04-2014 11:07 PM

A picture would help but I think I know what hole you are talking about , is it #36 for the two bolts #41 ?,you have a few choices but let us know which one is the one that you need to repair.
http://www.ereplacementparts.com/images/dewalt/DW788_TYPE_1_WW_2.gif

-- Ken from Ontario, Canada

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MrUnix

4207 posts in 1660 days


#4 posted 01-05-2014 12:06 AM

Pictures would get you a faster answer :) A lot depends on how much force is applied to that screw.. if it’s just holding on some sheet metal cover and doesn’t receive much pull, then re-taping it out and using a bigger screw is an option. You could also fill the hole with JB weld, drill and re-tap. The ‘spring’ thing Randy mentioned is known as a heli-coil. To use it, you will still need to drill out the hole to a bigger size, tap the new hole and then thread the spring into the newly tapped hole. Each size requires a specific sized drill and tap, but they do come in kits with everything needed. Really over kill if the part doesn’t see a lot of stress and won’t work if you don’t have enough thickness to fully insert the heli-coil (Ie: it won’t work on sheet metal). Give us a picture or let us know what screw you are talking about using the diagram Ken pointed to!

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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Vinnie

100 posts in 2850 days


#5 posted 01-05-2014 12:07 AM

Ken, It’s #44 the two small screws on each side of the yellow covers that hold the whole bottom blade arms in place.
One screw hole got stripped on the right bottom side….top hole.

Thanks, Vinnie

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com

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distrbd

2227 posts in 1907 days


#6 posted 01-05-2014 12:20 AM

Let me guess,were you trying to correct the blade front-back movement?I have done that and almost stripped the same hole ,lol.
Anyhow,Brad(mr unix)JB weld solution is what I would also recommend.fill the hole ,wait a good 24 hours or so,drill/tap and you are done,but this time don’t tighten it too much,it really does not need to be that tight.
Best of luck.
Ken.

-- Ken from Ontario, Canada

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distrbd

2227 posts in 1907 days


#7 posted 01-05-2014 12:25 AM

You may also leave it and see if you could operate the machine without doing all the above ,see if the other 3 bolts hold the piece tight enough.I think they do but if you want to have peace of mind and do it right then that’s what I would do.

-- Ken from Ontario, Canada

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SteveMI

954 posts in 2755 days


#8 posted 01-05-2014 12:37 AM

I ended up re-tapping all four holes to the next size up.

And yes, I was also “Let me guess,were you trying to correct the blade front-back movement?”

Steve.

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Vinnie

100 posts in 2850 days


#9 posted 01-05-2014 12:54 AM

Here is a picture. Yes, I did make the fix for the front back movement. This was because I just greased all of the bearing and put the saw back together. Wouldn’t you know it…it was the last screw I put in.

Thanks a bunch guys. I guess I will have to buy a tapping kit.

Vinnie

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com

View distrbd's profile

distrbd

2227 posts in 1907 days


#10 posted 01-05-2014 01:15 AM

Vinnie,you could buy just the drill/tap kit for that particular hole,Home Depot sells them,I think the size is M5

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/dewalt/DW788_TYPE_1

http://www.toolpartsdirect.com/cgi-bin/parttools.cgi/286300-00

-- Ken from Ontario, Canada

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Vinnie

100 posts in 2850 days


#11 posted 01-05-2014 01:20 AM

Well, I found a machine screw all most identical same length and just wide enough to catch. It tighten up, its a phillips head and I am leaving it alone. Wow it’s a blessing.

Thank you guys for all your help. I know now if I do take it apart again I will have to maybe tap a new hole.

You guy are great! Thanks a bunch!

Vinnie

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com

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Vinnie

100 posts in 2850 days


#12 posted 01-05-2014 01:28 AM

Thanks again Ken, I will keep that in mind. I might have to do this anyway in the near future. I just ordered another DW788 I love the BIG YELLOW machine. If you lube them with the right grease they are as good as any scroll saw out there. Just my opinion.

The very best to all of you!

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com

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KS_Sparky

26 posts in 1084 days


#13 posted 01-05-2014 01:59 AM

For future reference, tapping (or retapping) is really easy as long as the material isn’t real thick or stainless steel. Make sure you use the correct size drill bit for your tap, use plenty of Rapid-Tap for lubrication, keep the tap straight, and go slow. I also back the tap off after every half turn or so to clear out any shavings. Re-tapping the hole to the next size would be a much better solution than jb weld or an insert, both of which would also involve tapping the hole anyway.

-- apprentice Electrician, IBEW L.U. 226

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Vinnie

100 posts in 2850 days


#14 posted 01-05-2014 02:43 AM

Thanks…KS_Sparky for the info!

-- Personalized name sign,custom name signs wood puzzles, home decor http://www.kerflinecrafts.etsy.com

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