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Equipment Discussions >> ATM, Optics and DIY Forum

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larry7
member

Reged: 11/30/08

screws new

new

#5361780 - 08/10/12 01:53 PM

Can anyone tell me where I can find stainless screws with delrin or nylon tips for a finder scope? Thanks...

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RossSackett
Pooh-Bah

Reged: 08/17/07

Loc: Memphis, TN

Re: screws new

new

[Re: larry7]
#5361794 - 08/10/12 02:00 PM

Try McMaster-Carr mcmaster.com

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Pinbout
Post Laureate

Reged: 02/22/10

Loc: Montclair

Re: screws new

new

[Re: larry7]
#5361796 - 08/10/12 02:02 PM

how about black nylon screws.

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amicus sidera
Carpal Tunnel

Reged: 10/14/11

Loc: East of the Sun, West of the M...

Re: screws new

new

[Re: Pinbout]
#5361842 - 08/10/12 02:22 PM

I've never come across such screws with nylon tips as a stock item... I trust you find them. If you can't locate any, obtain the stock screws of the correct length and some delrin/nylon rod of the correct diameter, hand them to a friend or acquiantance with a lathe (along with a small consideration, if need be), and let him drill out the screws and press-fit the rods in place.

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Pinbout
Post Laureate

Reged: 02/22/10

Loc: Montclair

Re: screws new

new

[Re: amicus sidera]
#5361860 - 08/10/12 02:29 PM

http://www.mcmaster.com/#nylon-tipped-socket-head-cap-screws/=ishf3l

but they aren't s.s.

Edited by Pinbout (08/10/12 02:30 PM)

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don clement
Vendor (Clement Focuser)

Reged: 02/02/11

Loc: Running Springs, California

Re: screws new

new

[Re: Pinbout]
#5362024 - 08/10/12 04:15 PM

I make my own from SS SHCSs with a press-on Shear-loc thumb knobs http://www.shear-loc.com/?gclid=CPOW77Pu3bECFSI0QgodoncAyw . I machine a Delrin tip to accept a SS roll pin or ground SS pin. Shear-loc press-on thumb knobs also press on Nylon SHCSs. If the Nylon SHCS doesn’t come in black they can be dyed using RIT dye available from most supermarkets. http://www.ritdye.com/

Here is a picture of 1/4-28UN black dyed Nylon SHCS with Shear-loc pressed-on thumb knobs holding an 80mm finder:
(Also note in the lower right hand of this picture an example of a grey Shear-loc thumb knob on a 6-32UN SS SHCS).

The really nice thing about this is no lathe or machine tools needed for making excellent DIY Thumb screws.

Don Clement

Edited by don clement (08/11/12 01:26 PM)

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Pinbout
Post Laureate

Reged: 02/22/10

Loc: Montclair

Re: screws new

new

[Re: don clement]
#5362186 - 08/10/12 06:10 PM

Very cool

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Noisykids
sage

Reged: 06/01/11

Loc: ma

Re: screws new

new

[Re: Pinbout]
#5362214 - 08/10/12 06:33 PM

i just outfitted some rings with nylon 1/4 20 screws and put rubber grommets on the ends,slightly undersized grommets that fit tightly. seems to work and only cost 5 bucks or so. i drilled and tapped the holes and use a nylon nut to lock the screws in place.
eta...i saw a thread here the other day that linked to a site that sold 3/8 24 delrin tipped screws for this exact purpose. they were about 5 bucks apiece, sold in three lengths.
further edited.... telescope stuff

Edited by Noisykids (08/10/12 06:46 PM)

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don clement
Vendor (Clement Focuser)

Reged: 02/02/11

Loc: Running Springs, California

Re: screws [Re: Noisykids]
#5363380 - 08/11/12 01:50 PM

Here is a picture of a Delrin tipped SS thumbscrew I made from a 2.5” ¼-28UN SS SHCS, 3/16” diameter Delrin stock, ¼” Shear-Loc press-on Thumb knob and 1/8” ground SS roll pin. All parts were purchased from McMaster-Carr. I might add that when using DIY thumbscrews I find it best to use an oversize tap when making a threaded hole especially when using Nylon screws. E.g. for a 1/4-28UN hole I use a 1/4-28UN H6 tap. For every H value on a tap the tap is oversize by 0.0005" so an H6 tap is 0.003" oversize.

Don Clement

Edited by don clement (08/12/12 11:12 AM)

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StarStuff1
Carpal Tunnel

Reged: 04/01/07

Loc: South of the Mason-Dixon Line

Re: screws new

new

[Re: don clement]
#5364951 - 08/12/12 03:49 PM

Small Parts Inc has nylon screws, thumbnuts and whatever with reasonable pricing. A great resource for many things. I have been a customer of theirs for decades.

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Gordon Rayner
Carpal Tunnel

Reged: 03/24/07

Re: screws new

new

[Re: don clement]
#5365091 - 08/12/12 05:37 PM

Where is the roll pin?

In a deeply tapped hole, a blob of solder, or a piece of brass or Delrin or ABS or nylon, Lexan, etc. ,cushions the tip of the screw which pushes, thus avoiding scoring or marking the piece which is to be secured.

Brass or plastic rod is easy to find at model car/airplane/boat hobby supply shops.

Thumbnuts which fit 1/4 inch threads are available from Microplastics in Flippin, Arkansas. Shear-Loc sell these also. The same product can be used to fit the head of a hexhead screw or the nut for the same thread diameter.

I have been vise pressing knobs, easily made as square pieces of Delrin, Lexan, or ABS, onto 12-point headed screws, hex headed screws, and hex nuts. The drill diameter should clear the width across the flats , or the distance between the bottoms of opposing v-grooves across a 12-point screw's head.

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TxStars
Pooh-Bah

Reged: 10/01/05

Loc: Lost In Space

Re: screws new

new

[Re: larry7]
#5365527 - 08/12/12 10:04 PM

Check out this:
http://www.jwwinco.com/products/section8/#knobs-with-four-lobes-or-prongs

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don clement
Vendor (Clement Focuser)

Reged: 02/02/11

Loc: Running Springs, California

Re: screws new

new

[Re: Gordon Rayner]
#5365582 - 08/12/12 10:41 PM

Quote:

Where is the roll pin?

In a deeply tapped hole, a blob of solder, or a piece of brass or Delrin or ABS or nylon, Lexan, etc. ,cushions the tip of the screw which pushes, thus avoiding scoring or marking the piece which is to be secured.

Brass or plastic rod is easy to find at model car/airplane/boat hobby supply shops.

Thumbnuts which fit 1/4 inch threads are available from Microplastics in Flippin, Arkansas. Shear-Loc sell these also.

I have been vise pressing knobs, easily made as square pieces of Delrin, Lexan, or ABS, onto 12-point headed screws, hex headed screws, and hex nuts. The drill diameter should clear the width across the flats , or the distance between the bottoms of opposing v-grooves across a 12-point screw's head.

The ¾” length 1/8” diameter solid SS ground pin was pressed into a 3/8” deep 1/8” diameter hole in the end of the ¼-28UN SS SHCS. The 3/16” diameter ½” long Delrin part is bored with a 1/8” hole in order to slip onto the pin at the end of the screw. A 45 degree chamfer is machined in the end of the Delrin part. The chamfer and the rigidity of the SS 1/8” pin allow this thumb screw to bear against a circular groove on a part which has a similar 45 degree chamfer so this thumb screw not only puts pressure in the axial direction but also pulls the part towards a machined land, holding the part in two directions with one thumb screw.Here is a photo of the 1/8" pin at the end of the SHCS with the Delrin part removed.

Don Clement

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Gordon Rayner
Carpal Tunnel

Reged: 03/24/07

Re: screws new

new

[Re: don clement]
#5366400 - 08/13/12 12:46 PM

Interesting. But I have not run a lathe since a long period of night school parasitism , and sold a mill for which I never made room in the garage.

SS drilling , while not as bad as titanium or high nickel turbine parts, is no fun: work hardening if woodpeckered, stinky animal fat coolant/lubricant, wear on drill bits.
It goes with the job.

Is there an off-the shelf functional equivalent?

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don clement
Vendor (Clement Focuser)

Reged: 02/02/11

Loc: Running Springs, California

Re: screws new

new

[Re: Gordon Rayner]
#5366837 - 08/13/12 04:33 PM

Quote:

Interesting. But I have not run a lathe since a long period of night school parasitism , and sold a mill for which I never made room in the garage.

SS drilling , while not as bad as titanium or high nickel turbine parts, is no fun: work hardening if woodpeckered, stinky animal fat coolant/lubricant, wear on drill bits.
It goes with the job.

Is there an off-the shelf functional equivalent?

There is no off-the-shelf equivalent that I know of or else I certainly would have bought them instead of making them. This screw was made to solve a specific problem. Yes! SS ( apart from 303 SS) is a bi#%h to machine. I use coated carbide insert tooling for turning and either a solid carbide MA Ford 135* splitpoint drill or cobalt HSS 135* splitpoint drill to make the hole. Also, IMO great smelling bacon grease does work well but I got a great deal of $5 for 5gallons container (for me a lifetime supply) of Mobilmet Omega cutting oil. Oh yeah I still have a can of original TapMagic fluid with 1,1,1 Trichroroethane that works great on all types of SS however one must use a respirator if one is concerned about one's health.

Don Clement

Edited by don clement (08/13/12 04:39 PM)

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Thom L
newbie

Reged: 07/01/12

Re: screws new

new

[Re: larry7]
#5366946 - 08/13/12 05:29 PM

I just checked McMaster-Car and yes they do have steel swivel headed screws with nylon tips. They also have nylon acorn nuts you can use on their SS screws with the plastic thumbscrews.

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Gordon Rayner
Carpal Tunnel

Reged: 03/24/07

Re: screws new

new

[Re: don clement]
#5366992 - 08/13/12 05:47 PM

I still have some 1,1,1 trichloroethane ( the ozone depleter). Does it work for SS undiluted? Or, with what might one mix it for a suitable approximation to the formerly used TapMagic? Maybe they would tell me? Probably not. Energine brand spot remover was straight 1,1,1 for a long period, my nose told me. I believe that they used trichoroethylene for a while also. That formerly widely used solvent for vapor degreasing, probably still unequaled, was OSHA or EPA banned for neurotoxicity and maybe also as a suspected carcinogen (?).

There was a very obese "student" (RIP), machining and polishing stainless steel bathtub fixtures, who was interested to hear that I had some 1,1,1. But he died in about two weeks, before I tried to re-connect. He was already using supplementary oxygen and sat in a walker at the lathe. His health problems were unrelated to the 1,1,1. He had formerly been using the TapMagic 1,1,1. He had been super-obese for decades.

I wonder if perchloroethane, the formerly widely used dry-cleaning solvent ( no longer available?) would substitute for 1,1,1 for stainless steel machining, either undiluted, or as part of a mixture of easily obtained (?) other ingredients?

For intense use of 1,1,1 or perc or lacquer thinner, or when spraycan painting, I used/use the gas filter civilian defense full-face masks made in Germany, formerly (presently?) available as Israeli military surplus at USA gun shows and surplus outlets.

Suitable rubber gloves are of course desirable.

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Gene7
scholastic sledgehammer

Reged: 06/10/10

Loc: Mid Ohio, USA

Re: screws new

new

[Re: Gordon Rayner]
#5367901 - 08/14/12 08:39 AM

WHY all of the fuss??????? Just use a brass screw. Gene

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careysub
Pooh-Bah

Reged: 02/18/11

Loc: Rancho Cucamonga, CA

Re: screws new

new

[Re: Gordon Rayner]
#5367978 - 08/14/12 09:47 AM

Quote:

I still have some 1,1,1 trichloroethane ( the ozone depleter). Does it work for SS undiluted? Or, with what might one mix it for a suitable approximation to the formerly used TapMagic? Maybe they would tell me? Probably not. Energine brand spot remover was straight 1,1,1 for a long period, my nose told me.

I also have a couple of partial cans of 1,1,1 trichloroethane Energine - it hasn't been manufactured for many years anywhere in the world and a few ounces is worth several hundred dollars today. There is demand for it in specialty applications.

Unless it is destroyed in some chemical process, it will inevitably end up in the atmosphere - I'd rather it see used in some high-value application than simply released doing little or no good to anyone.

I offered to send it for free to DGR Industrial Products, Inc, which sells it (when they have some. They were eager to get it, it seemed, but failed to send me the packing and shipping box with Fedex label as promised. Your post reminds me to bug them again.

I suppose I could offer it for sale on eBay, but would be leery of possible legal risks.

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don clement
Vendor (Clement Focuser)

Reged: 02/02/11

Loc: Running Springs, California

Re: screws new

new

[Re: careysub]
#5368245 - 08/14/12 12:23 PM

Here in California there is a black market in foie gras for those who have a high valued application. :-)

Edited by don clement (08/14/12 12:26 PM)

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