Help needed - any GABRO BF620 folder owners out there ?

[DSR]

I bought a Gabro BF620 a while ago, stripped it down, cleaned it and reassembled it. I'm missing the two backstop clamping screws - labelled 28 in the diagram below, they weren't in the packing when I got the folder and being in bits, I didn't notice they were missing until I came to assemble it.

I can knock a couple of them together on the lathe but I have no ideas of the dimensions. It's an old machine so all I'm certain about is the thread is 3/8" UNC and the dimensions will probably be in imperial units.

Can somebody fill in the dimensions for A, B, C, P, Q and R. I can guess and make the parts to my own numbers but I'd like something as close to the original as possible. Any hint on the length of the tommy bar would be useful too

Regards,


D

 

[gaz1]

@Burdekin may be able to help you with the sizes

 

[Agroshield]

Tommy bar 3/8" dia. 3 3/4" long.
Top 7/8" dia. 5/8" high.
Middle 5/8" dia. 1" high.
Lower 3/8" dia. 1 1/2" high.

Discussion below is food for thought and might help for a future problem of the same nature.

If you print out your diagram and enlarge on a photocopier until the known 3/8" dimension is actually 3/8" on the paper, you can measure the other dimensions straight away.

You can do a lot by looking at the diagram with your eyes and assessing proportions. The step in dia. between lower and middle looks the same as the step between middle and top. The step is about 1/3 the dia. of the lower part. The tommy bar dia. is the same as the lower part. The lower is about 50% longer than the middle. Height of top is same as dia. of middle. Tommy bar is longer than overall height. Step between tommy bar and edge of part it slides though is similar to step in diameters of vertical part.

Your own pencil sketch has captured the proportions quite well - maybe your middle section is a bit long if you compare with the diagram.

 

[indy4x]

@DSR I have the BF1000, I'm presuming the backstop screws will be the same as the BF620.

Its in my lockup but can pop in tomorrow and measure

 

[DSR]

Tommy bar 3/8" dia. 3 3/4" long.
Top 7/8" dia. 5/8" high.
Middle 5/8" dia. 1" high.
Lower 3/8" dia. 1 1/2" high.

Discussion below is food for thought and might help for a future problem of the same nature.

If you print out your diagram and enlarge on a photocopier until the known 3/8" dimension is actually 3/8" on the paper, you can measure the other dimensions straight away.

You can do a lot by looking at the diagram with your eyes and assessing proportions. The step in dia. between lower and middle looks the same as the step between middle and top. The step is about 1/3 the dia. of the lower part. The tommy bar dia. is the same as the lower part. The lower is about 50% longer than the middle. Height of top is same as dia. of middle. Tommy bar is longer than overall height. Step between tommy bar and edge of part it slides though is similar to step in diameters of vertical part.

Your own pencil sketch has captured the proportions quite well - maybe your middle section is a bit long if you compare with the diagram.

Thanks - I've done that in the past from photographs and it just never occurred to me to do it from the drawing - one of those not seeing the wood for the trees moments (or getting old)

My Middle section is a bit long - it's a bit rounder than it used to be as well

 

[DSR]

@DSR I have the BF1000, I'm presuming the backstop screws will be the same as the BF620.

Its in my lockup but can pop in tomorrow and measure

I think they are the same, the manual I have is for both models. I'm happy with @Agroshield's numbers so no need to trouble yourself with the lockup - but thanks for the offer.


D

 

[indy4x]

@DSR No worries