Joe Pie follow rest

[ChazzC]

Hazardous? I do know that it smells pretty bad when machined ---- I used a lot of it for bottling machine change parts.

The fine dust, particularly dust from whatever is laminated with the phenolic resin (cotton, linen, fiberglas and asbestos) is where the hazard lies.

 

[Richard King 2]

​

Respiratory morbidity in workers exposed to dust containing phenolic resin​

• Patricia Jo Sparks MD &
• John M. Peters

International Archives of Occupational and Environmental Health volume 45, pages221–229 (1980)Cite this article

• 58 Accesses
• 8 Citations
• Metricsdetails

Summary​

Seventy-three men and women exposed to phenolic resin dust and/or processed cotton dust in a factory producing sound-deadening material were studied cross-sectionally. There was a statistically significant acute drop in FEV1 and FVC over the shift in garnett-line workers exposed to dust containing phenolic resin. Pickers, exposed to processed cotton dust only, did not show a significant drop in FEV1 and FVC over the work shift. Thirty-five percent of the workers that had smoked cigarettes and had worked in the plant 5 years or more had an FEV1 less than 80% of predicted. This finding was not entirely explained by duration of cigarette smoking. Multiple regression analysis revealed that the longer the duration of exposure, the lower the ratio of FEV1 to FVC. Respiratory symptoms were related to current cigarette smoking but not to duration of employment. The study suggests that exposure to dust containing phenolic resin had both acute and chronic effects on pulmonary function.

 

[Richard King 2]

I have Asthma and I insisted that when my employee's machined Phenolic they wore a mask. Better safe then sorry.

The studies last line says: The study suggests that exposure to dust containing phenolic resin had both acute and chronic effects on pulmonary function.

 

[homebrewed]

I have Asthma and I insisted that when my employee's machined Phenolic they wore a mask. Better safe then sorry.

The studies last line says: The study suggests that exposure to dust containing phenolic resin had both acute and chronic effects on pulmonary function.

It wasn't my intent to dispute the negative effects of phenolic dust. I agree that the dust is gonna be bad news. I apologize if my comment came across any other way.

 

[Parlo]

I was watching this Joe Pie video in which he makes a phelonic follow rest for machining (threading) a long thin rod: Extended small diameter threading using a DIY follow rest. This looks like something that I could use. Has anyone made this or something similar? Even with a live center some long, thin pieces flex in the middle.

Edit: Phelonic looks pretty pricey. Any ideas for alternatives.

Just remember that using a follow rest when threading will not cure a bent bar nor does it guarantee a straight thread, just a constant diameter.

 

[silence dogood]

Why not use delrin?

 

[Dabbler]

Why not use delrin?

Delrin melts due to friction easily. This is a very old-school thing I was shown in the early 70s. It is very effective for a variety of things, such as cutting E-clip grooves in small diameter material. Phenolic has high heat tolerance. (that's why it was used in circuit boards in high heat tube days, long before g10 epoxy and transistors).

No worries about dust here. It doesn't break down hardly at all. I have used this on smooth 1/8" shafts for cutting hundreds of grooves, and never needed adjusting, so minuscule wear.

 

[Parlo]

You could make something like this where the knurls are replaced by bearings. Self aligning; and covers a range of diameters. Just replace the tufnol piece with something like the image approximately on the centreline and away you go. If you prefer tufnol make tufnol rollers instead of bearings.

 

[silence dogood]

Delrin melts due to friction easily. This is a very old-school thing I was shown in the early 70s. It is very effective for a variety of things, such as cutting E-clip grooves in small diameter material. Phenolic has high heat tolerance. (that's why it was used in circuit boards in high heat tube days, long before g10 epoxy and transistors).

No worries about dust here. It doesn't break down hardly at all. I have used this on smooth 1/8" shafts for cutting hundreds of grooves, and never needed adjusting, so minuscule wear.

Thanks, that makes sense. Although Parlo came up with a neat idea.

 

[Jimsehr]

Thanks, that makes sense. Although Parlo came up with a neat idea.

I made one years ago that I called - not a follow rest - to turn and form small dia long parts . It has 3 roller bearings that support dia just ahead of the cutting tool.
And is adjustable for stock size.
jimsehr

Easy to turn foot or longer shaft 1/8 dia.