Holding down your parts

[furry]

I used these on my 6x4 router.. so far they have been perfect and are easy to install as the taper helps align them to the hole..although screwing a few hundred into a laminated mdf tabletop isn't exactly fun..

They've been more than sufficient and even hold down 10mm aluminium for milling/routing without moving.

Got them from http://www.profhdwr.com/55008.htm

[dmgdesigns]

Robbie you have figured it out. It has been a while but you do get a special tap for the 1/4-20 helical and run it through the 1/4-20 hole. Then screw the insert in and break off the little tab. Now you have a repaired 1/4-20 hole.

I was wondering if someone could explain to me how Helical Inserts like item number 96246A755 at mcmaster.com works. Are they to repair a thread thats already there. If so; is one that has a internal thread size of 1/4-20 for a repair of a 1/4-20 thats already there. If it is how do you get it into the original one. Do you just tap it out to a bigger size? Thanks- Robbie

[CNCRob]

Thanks Mark

[automizer]

has anyone used toggle clamps, like these
Toggle Clamps

[buscht]

automizer, I have used toggle clamps. You just have to be careful when programming to make sure you don't accidentally run into them during a rapid move.
It can be pretty ugly.

[gbowne1]

In the shop where I worked at they used double sided tape. Removal of the residue? A few small squirts of MEK (Methyl Ethyl Keytone).

Not the best idea as MEK is a known carcinogen but, hey it worked!

Greg

[furry]

Not sure how widely it's available overseas, but in here in australia Eucalyptus Oil is used to remove labels/tape, almost anything leaving a sticky residue.

And it's natural!

[ImanCarrot]

If you get the Double Sided tape from RS catalogue (the economy stuff) if just peels off in one go leaving virtualy no residue- I use this on plastic lenses and it holds the parts real good- I give the lenses a wipe with Methanol just in case they are slightly contaminated- i usualy use Acetone to remove residue, but not on plastic lenses obviously. The other expensive Double Sided tape is no good as it goes all gooey.

[darde]

http://www.rockler.com/ecom7/product...DADADADADADADB

[darde]

SPAENAUR. Try a search for them and then email them with the part numbers
191-020
191-021
191-001
They are a tnut with a rectangular flang on the bottom and holes for screws to keep them in place
The part number 191-001 is for 1/2" bolts.

[darde]

http://images.rockler.com/tech/68387.pdf

[Grifftek]

Hi Guys

I have been usin g2way tape for years also. I have found a tape that looks like masking tape but sticky on both sides where the middle layer is paper. Same company has tape with a mylar center while stronger, I have not has the best results when trying to remove it.

the majority of the parts I machine are aluminum or plastic (http://tinyurl.com/6t2oa)
I have a nice hot plate that I use to warm up the base plate. I have never measured the temperature, but just at the right moment, you can turn off the heat and very easily remove the parts and the tape with no leftover residue.......But go a little over the correct temperature and you ahve a big sticky mess as the adhesive releases from the paper. On the mylar stuff, the adhesive seems to always come off the mylar no matter what.

I have 6 parts stuck down with the tape right now running in the machining center! If it werent for 2way tape and superglue Id never get anything done!

Oh, i forgot to mention that I also use the hydraulic press to seat the material to the base plate. I find that when both surfaces are very flat and the press is used I can use flood coolant but if I use extruded bar stock, the surfaces is not flat or smooth enough and the coolant will migrate under the parts and they will release...

The tape I use comes from Related Products 800-423-3564 The sales guy I buy from is Jim Leiberman. He always gives me fantastic service even though were a low volume user. I but it in several widths up to 6" wide.

Here is a link to a vacuum fixture I made for machining cred card stock http://tinyurl.com/coave


Hope this helps someone

Bill Griffin